Sellers of charging products looking to enter the Brazilian market have mostly heard of ANATEL certification, but many only know it as “some kind of mandatory certification” — either they assume all USB-C chargers need it, or they think having FCC/CE is enough to get by, only to end up stuck with customs detention or e-commerce delisting. In this article, we start from the most basic concepts, combine practical scenarios for charging products, and thoroughly explain the judgment methods, application rules, and pitfall avoidance points for ANATEL product approval. From beginner to semi-proficient, you can apply what you learn right after reading.
First, Understand the Basics: What is ANATEL, and What Does It Regulate?
ANATEL, short for the National Telecommunications Agency of Brazil (Agência Nacional de Telecomunicações), is the official Brazilian agency responsible for market access of telecommunications and radio products. Its core regulatory logic is simple: **Devices that fall under ANATEL’s regulated product categories and are subject to mandatory approval requirements must complete the corresponding conformity assessment and obtain approval before being commercialized in Brazil**, to reduce radio interference and ensure the normal operation of public communications and telecommunications networks. The mere presence of electromagnetic radiation or wireless energy transmission does not automatically mean ANATEL approval is required.
For charging products, there is a very important judgment premise that must be memorized first: **Whether ANATEL regulates your product has nothing to do with power level or whether it has a USB-C interface. It mainly depends on whether the product is a regulated telecommunications product, restricted radiation device, or other applicable category, and whether there are corresponding exemption rules.** Many people think chargers with USB-C need ANATEL, but in fact, USB-C is a purely wired interface and has nothing to do with radio regulation.
So what exactly is the commonly mentioned “ANATEL certification”? More accurately, it usually refers to product approval under the ANATEL Telecommunications Product Conformity Assessment and Approval System. For products legally subject to mandatory ANATEL approval, obtaining valid ANATEL approval and the corresponding **Anatel ID** is an important prerequisite for commercialization; however, the product must also meet labeling, product consistency, and other applicable regulatory requirements. The entire process usually includes: applicable testing completed by an accredited or designated laboratory, corresponding assessment and document issuance by an ANATEL-authorized Conformity Assessment Body (abbreviated as OCD), and then the applicant submits the approval application in accordance with ANATEL’s systems and procedures. After ANATEL makes an approval decision, the product will be registered with the corresponding Anatel ID.
For charging products that require mandatory approval, having valid ANATEL approval and the corresponding Anatel ID is an important basis for judging whether relevant access requirements have been completed. For products not within the mandatory scope or eligible for exemption, Anatel ID cannot be regarded as a unified sales condition applicable to all products.
If products that legally require approval are directly shipped to Brazil for sale, the test report itself cannot replace ANATEL approval. Valid approval must be obtained and requirements such as labeling must be met before commercialization. Specific customs clearance and platform handling also depend on the product category, import situation, and law enforcement rules. When purchasing smart charging, wireless communication, or other potentially regulated charging products, checking the Anatel ID and verifying official registration information is also a way to quickly judge compliance status.
Three Most Common Cognitive Misconceptions
Let’s clarify the most common misunderstandings first, so we won’t go off track when making judgments later:
1. **It’s not only Bluetooth and Wi-Fi products that need it**: Wireless communication functions such as cellular, Bluetooth, and Wi-Fi usually need to be evaluated according to ANATEL’s corresponding product classification. For wireless charging products, it cannot be determined that approval is required or not required solely because they have wireless energy transmission. It should be confirmed in combination with the specific technical solution, operating frequency, power, product classification, and current exemption rules. Wireless charging and cellular communication do not follow the same regulatory logic.
2. **Overseas certifications such as CE and FCC cannot directly replace ANATEL approval**: Whether existing overseas test reports can be accepted must be confirmed according to applicable technical requirements, laboratory qualifications, report content, and OCD review results. Overseas certifications cannot be directly regarded as local Brazilian approval.
3. **USB-C is a wired interface and has nothing to do with ANATEL regulation**: Do not confuse interface type with radio regulation. Purely wired USB-C chargers, no matter how high the power, are usually not within the scope of ANATEL telecommunications product approval. However, whether the product also needs to meet INMETRO or other regulations still needs to be judged separately.
Does Your Charging Product Need ANATEL? Four-Step Self-Check Method
After understanding the basic concepts, the most practical thing is to make a preliminary judgment by yourself first, without spending money to find an agency right away. You can follow the four steps below:
Step 1: Preliminary Screening by Product Category
First look at the core form of the product to quickly exclude categories that are usually not within the scope of ANATEL approval:
• Purely wired power supply products, such as ordinary wired chargers and charging cables, are usually not within the regulatory scope of ANATEL;
• Wireless charging products cannot be judged solely by the word “wireless”, and need to be further compared with specific technical solutions, frequencies, powers, and product classifications;
• Charging products with wireless communication or cellular access functions need further evaluation, and should usually be judged according to the corresponding ANATEL product category.
Step 2: Collect Key Judgment Information
To make an accurate judgment, you must first gather the core information, don’t just ask with a product name:
• Basic information: specific use of the product, whether it is a complete machine or a module, whether it has a built-in battery or power supply;
• Wireless parameters: wireless standard used (such as Bluetooth 5.3, Wi-Fi 6; for Qi wireless charging, the specific working principle and parameters must also be confirmed), operating frequency band, maximum transmit power, antenna specifications and installation position;
• Network attributes: whether it will access Brazil’s public telecommunications network, whether it has a SIM card interface.
Step 3: Match Official Classification Rules
Use the collected information to check ANATEL’s publicly available list of regulated product classifications and applicable technical requirements, and compare the product’s functions and parameters to confirm whether it is within the regulatory scope and what conformity assessment procedure applies. If it is a scenario with blurred boundaries, don’t guess by yourself. It is recommended to consult a local Brazilian applicant or an ANATEL-authorized agency.
Step 4: Seek Professional Final Confirmation
Self-check is only a preliminary judgment. The final conclusion must be confirmed by an ANATEL-authorized OCD (Conformity Assessment Body) or a qualified local Brazilian applicant. Never draw conclusions based solely on the product name or the parameter sheet provided by the module manufacturer — in many cases, the antenna design, power adjustment, and product use of the complete machine will affect the final applicable product classification and technical requirements.
Judgment Reference for Common Charging Products
To make it easier for everyone to find the right match, we have sorted out the judgment directions for several of the most common charging products:
• **Types that usually require evaluation**: Smart charging heads or charging stations with Bluetooth/Wi-Fi control (including wireless communication functions), energy storage power supplies or charging bins with cellular communication (accessing public telecommunications networks), wireless charging stands or in-car wireless chargers (need to be evaluated in combination with specific working principles, frequencies, powers, and applicable rules).
• **Types that usually do not require ANATEL approval**: Purely wired chargers, power adapters, in-car chargers (without any wireless or telecommunications functions), purely wired charging cables, adapters, plugs (purely wired accessories), ordinary power banks without communication functions, power strips (without wireless or telecommunications functions). Whether these products also need to meet INMETRO or other regulations should be confirmed separately according to their respective product types.
Two Special Cases That Are Easy to Misjudge
1. Does a complete machine with a built-in approved module still need ANATEL?
The answer is **no automatic exemption**. Even if the built-in wireless module itself has an Anatel ID, several key points must first be verified: whether the module’s ID is still valid, what the conditions of use for the module are, whether the complete machine’s antenna design and output power meet these conditions, and whether the radio frequency characteristics of the complete machine have changed.
If the complete machine meets the use conditions specified in the module approval and has not changed the radio frequency characteristics that affect conformity, simplified or module-based assessment arrangements may apply; if relevant characteristics are changed, additional testing or re-processing may be required. The specifics shall be confirmed by the OCD in accordance with applicable procedures.
2. Don’t Jump to Conclusions About These Boundary Scenarios
• Pure electromagnetic induction wireless charging pads (such as Qi): It cannot be determined that ANATEL is required or not required solely based on “wireless charging”. It must be evaluated in combination with the working principle, operating frequency, transmission power, product classification, as well as current technical requirements and exemption rules.
• Chargers with infrared remote control: Infrared signals are generally not treated as radio frequency communication, but if the product also has Bluetooth, Wi-Fi, or other radio frequency remote control modules, it needs to be evaluated according to the relevant product category.
• Products with the same appearance but different configurations: For example, a charging head with the same appearance, the standard version is purely wired, and the upgraded version adds Bluetooth function. The upgraded version must be evaluated separately and cannot apply the conclusion of the standard version.
Core Rules of ANATEL Product Approval
If the preliminary judgment is that it needs to be done, first understand these core rules to avoid a lot of detours.
What is the Overall Access Process?
The entire access process can be understood as four steps. Note that the OCD is a third-party organization authorized by ANATEL, not ANATEL itself, which many people confuse:
1. **Product classification confirmation**: First clarify which category the product belongs to and what technical requirements apply, to avoid using the wrong standard;
2. **Conformity assessment**: According to the applicable procedure, relevant testing is completed by an accredited or designated laboratory, and the OCD is responsible for the corresponding conformity assessment and data review;
3. **Submit approval application**: The applicant submits materials in accordance with ANATEL’s systems and procedures, and ANATEL makes the final approval decision and registers the corresponding Anatel ID;
4. **Labeling and post-launch maintenance**: Mark the approval information on the product as required, and continue to maintain compliance after listing.
Applicable Rules for Approval ID
The scope of application of the Anatel ID is subject to the approval certificate and official registration information, and cannot be applied between models or configurations that are not covered. Whether products of the same series can be shared or included in the same application must comply with specific series or family rules and be confirmed by the OCD.
If multiple models meet the series or family conditions specified by the corresponding product category, and the differences between models do not affect the applicable technical requirements and test results, they can be applied for inclusion in the same series. The specific conditions depend on the product category, conformity assessment procedure, and current technical requirements, and cannot be determined solely based on the same core wireless module, antenna, or appearance.
How to Check the Validity Period?
The conditions for continued validity, maintenance, change, and re-assessment of ANATEL approval are determined by the product category and applicable procedures. It cannot be generally assumed that all approvals have a fixed expiration date, nor can “expired without renewal” be regarded as a common reason for invalidation of all approvals.
The most accurate judgment method is to directly query the approval status in ANATEL’s official database, and confirm with the OCD whether there are annual or periodic maintenance, regulatory updates, change declarations, or re-assessment requirements. Product changes, regulatory updates, and changes in approval status may affect subsequent commercialization.
Labeling Use Requirements
The product must display the Anatel ID or approval label in accordance with applicable rules. As for whether electronic labels can be used, or whether packaging can replace the body label, it depends on the specific product category and current regulations, and cannot be changed arbitrarily. If you want to verify the authenticity of the ID, you can directly enter the ID in ANATEL’s official database to query.
Compliance Responsibility Chain: Who Should Do What?
ANATEL’s compliance responsibility is divided into chains, and each role must bear corresponding obligations:
• **Manufacturer**: Ensure that the product meets technical requirements, and the provided materials are true and complete;
• **Local Brazilian applicant**: The applicant must usually be a supplier or legal person established in accordance with the law in Brazil, and submit the application in accordance with the rules and bear corresponding responsibilities; overseas manufacturers shall handle it through a qualified local Brazilian applicant, and the specific authorization documents and responsibility arrangements shall be determined by applicable procedures;
• **Importer**: Ensure that imported products are consistent with the approval scope and registration information, and keep compliance materials properly;
• **Accredited laboratory**: Complete testing in accordance with applicable requirements and issue a true test report;
• **OCD**: Conduct conformity assessment, review materials and test reports in accordance with procedures, and complete corresponding application documents;
• **ANATEL**: Responsible for final approval, market supervision, and violation investigation and punishment.
Here is a special reminder for cross-border sellers: For products that legally require ANATEL approval, you cannot just take the laboratory test report as having completed access. Effective approval must be obtained and requirements such as labeling must be met before commercialization; specific customs clearance and sales arrangements must also be confirmed in combination with product categories, import situations, and relevant law enforcement rules.
Entry-Level Application: Process, Cycle, and Cost
Many people who apply for the first time are most concerned about: what to prepare? How long will it take? How much will it cost? What is mentioned here are industry-wide empirical values, and the specifics depend on the actual situation of the product.
Three Prerequisite Conditions for Early Stage
Prepare these before applying, which can save a lot of time:
• **Entity requirements**: Usually, a qualified local Brazilian applicant is required to handle it, and overseas manufacturers must issue authorization documents in accordance with applicable procedures;
• **Document requirements**: Need to provide Portuguese manuals, wireless parameter tables, core module materials (if the module has an Anatel ID, also provide it), label drafts, bill of materials (BOM), version descriptions;
• **Sample requirements**: Try to provide finalized finished products of the final sales version, not just engineering prototypes that have key differences from the mass production version. The number of samples depends on the specific test plan.
Core Application Steps
The actual application process corresponds to the access framework mentioned earlier. In practice, it is: first confirm the product classification and applicable requirements, select an ANATEL-accredited or qualified laboratory and OCD, and submit application materials; then send samples for testing, and if they fail, rectify and retest; after the testing is completed, the OCD reviews relevant materials and reports in accordance with procedures, and the applicant then submits the approval application in accordance with ANATEL procedures; it is only after ANATEL makes the approval decision and registers the Anatel ID that the corresponding access is completed.
Common Test Items (Don’t Confuse Jurisdiction)
The test items are determined by the product category and applicable ANATEL technical requirements, and a single test list cannot be applied to all products. Depending on the product situation, they may include:
• **Radio frequency parameter test**: Verify whether the frequency, power, etc. of wireless signals meet applicable requirements;
• **Electromagnetic Compatibility (EMC) test**: Confirm that the product will not cause non-compliant interference to surrounding equipment, and also has corresponding anti-interference ability;
• **Electromagnetic exposure test**: Wireless transmitting products used at close range may need to undergo relevant exposure assessment according to applicable requirements; SAR is not a universally mandatory test item for all wireless products;
• **Network interface or other special tests**: Equipment that accesses the public network or belongs to specific telecommunications product categories may need to undergo network interface or other applicable tests;
• **Safety and other items**: The conformity assessment technical requirements for some ANATEL product categories may also include corresponding safety or other tests, subject to the product category rules.
If the product also falls within the mandatory scope of INMETRO or other regulations, it must also meet the corresponding electrical safety, energy efficiency, plug specifications and other requirements respectively. INMETRO’s requirements belong to another compliance system, but it cannot be assumed that electrical safety is never part of ANATEL’s conformity assessment.
Cycle and Cost Reference
• **Cycle**: If the materials are complete and there is no rectification, 1.5–3 months can be used as an empirical estimate for some institutions, but it is not an official commitment, nor can it be used as a universal cycle for all products. The actual time depends on the product category, conformity assessment mode, test items, sample and document completeness, number of rectifications, and processing time of the laboratory, OCD, and ANATEL.
• **Cost**: There is no unified official pricing. Products with a single wireless function have relatively low costs, and products with multiple wireless functions or complex structures are more expensive. The main factors affecting the cost are: the number of wireless functions, product complexity, test items, whether rectification is required, whether the materials are complete, and whether additional assessment or maintenance is required.
Advanced Compliance: Authenticity Verification and Continuous Compliance
Getting an Anatel ID is not a once-and-for-all thing. Whether you applied for it yourself or purchased a product with an ID, you must know how to verify its authenticity and how to maintain its validity.
Three-Step Method for Approval Authenticity Verification
Don’t believe it just because you see an ID printed on the product. It’s reliable to check according to these three steps:
1. **Check the ID**: Go to ANATEL’s official approval database, enter the Anatel ID to query, and confirm that the ID is real;
2. **Match information**: Verify whether the model, wireless function configuration, approval scope, and applicant are consistent with the actual product. It is useless to only match the brand;
3. **Check status**: Confirm that the approval is currently in a valid state, has not been cancelled, suspended, or revoked, and check whether there are maintenance or update requirements.
Common Reasons for Approval Invalidation
Many people don’t pay attention after getting the ID, and end up selling when the status changes, causing problems. The common reasons are as follows:
• **Product changes**: The core wireless module, antenna, firmware or software that affects radio frequency have been replaced, but it has not been evaluated whether the approval needs to be updated;
• **Information inconsistency**: The product model, wireless configuration, or other registration information is inconsistent with the actual product;
• **Labeling issues**: The Anatel ID is not displayed as required, or the label information is wrong;
• **Status or maintenance issues**: Failure to perform the maintenance, change, or re-assessment obligations required by applicable procedures, or being suspended or revoked by ANATEL due to violations.
If the Product is Changed, Do You Need to Update the Approval?
Product iteration is common. Whether to update the approval is divided into four situations:
• **Changes that usually have little impact**: Only changing color, packaging, non-critical accessories, and not affecting wireless or other approved technical characteristics;
• **Requires evaluation**: Replacing the wireless module, changing the antenna position or specification, adjusting the firmware or software that affects radio frequency;
• **May require re-processing**: Adding new wireless functions, major changes in core radio frequency characteristics, or changes beyond the original approval scope;
• **Entity information change**: When the entity, supplier, brand, or importer changes, first confirm whether it involves the holder of the approval certificate or registration information. If eligible, you can apply for change, transfer, or maintenance; if it affects the approval responsibility or product scope, re-processing may be required.
Post-Launch Continuous Compliance Requirements
After the product is sold, compliance must also be maintained. Don’t wait until you are inspected to remedy:
• **Consistency requirements**: E-commerce pages, physical products, labels, and manuals must not contradict the model, wireless function, radio frequency configuration, and other approved technical characteristics approved by ANATEL;
• **Other information compliance**: Other parameters such as electrical, performance, and energy efficiency shall also comply with consumer protection, INMETRO, or other applicable regulations;
• **Change control**: Any change that may affect radio frequency or other approved technical characteristics must first be evaluated whether to update the approval, and cannot be changed first;
• **Status monitoring**: Regularly check the valid status of the Anatel ID, and pay attention to ANATEL’s regulatory updates and maintenance requirements;
• **Document archiving**: Import batch records, e-commerce page materials, and compliance documents must be kept properly for inspection.
Pitfall Avoidance Guide: 90% of Sellers Have Stepped on These Pits
Finally, let’s talk about a few of the most common pitfalls, all lessons learned with real money.
4 Most Common Types of Pitfalls in Application
• **Customs clearance pit**: No applicable valid approval, model not within the approval scope, non-compliant labeling, which may result in interception during import or market supervision. Solution: Before shipping, check in advance whether the product category, approval scope, registration information, and physical product are consistent.
• **E-commerce pit**: The approval status changes, or the wireless function and technical description on the listing are inconsistent with the approval scope, resulting in platform delisting. Solution: The wireless function, model, and approved technical characteristics on the page must be consistent with the official registration information, and do not add function descriptions randomly.
• **Testing pit**: Excessive power, frequency offset, failing the test. Solution: Be sure to evaluate with the complete machine configuration according to Brazil’s applicable frequency bands and technical requirements, and don’t just look at the module’s parameter sheet and think it’s okay.
• **Set pit**: The wireless charging accessories and adapters in the set have not been separately confirmed for applicable compliance requirements, and it is assumed that the host’s approval can cover them. Solution: Each wireless or telecommunications product in the set must confirm whether it needs separate approval according to its own product classification, and cannot directly apply the host’s Anatel ID.
Don’t Confuse ANATEL and INMETRO
Many people ask what the difference between these two certifications is, and whether they will be done repeatedly. Let’s clarify it once here:
• **Different jurisdictions**: ANATEL mainly regulates the access of telecommunications products, wireless communication equipment, and other products under its supervision; INMETRO regulates electrical safety, energy efficiency, metering, etc. within its mandatory scope;
• **Different applicable logic**: Both may apply at the same time (for example, a smart charger with Bluetooth function may need both ANATEL and confirmation of INMETRO requirements according to the product type), but they are not necessarily required at the same time — for example, a purely wired charger may only need INMETRO (if within the mandatory scope) and not ANATEL;
• **Whether INMETRO is required**: It depends on whether the product type is within INMETRO’s mandatory scope and the latest regulations, and cannot be generally said to be required or not required;
• **Cannot replace each other**: The two are different compliance systems, and must be applied for or their applicability confirmed separately according to their respective requirements.
Can Overseas Certifications Be Used?
Overseas certifications such as CE and FCC cannot directly replace ANATEL approval, and usually still need to be processed in accordance with Brazil’s applicable local access procedures. However, whether existing overseas test reports can be accepted depends on applicable technical requirements, laboratory qualifications, report content and format, and the OCD’s review results. Even if they cannot be used directly in the end, CE or FCC test materials can help identify design problems in advance and reduce rectification costs.
Decision Reference for 5 Common Products
We have sorted out the 5 most frequently asked charging products to help you make a quick preliminary judgment:
1. **Pure 65W USB-C GaN charger**: Usually does not require ANATEL, just verify whether it has any wireless or remote control function. Common misconception: Thinking that having USB-C requires ANATEL, but in fact USB-C is a wired interface and has nothing to do with it at all.
2. **Desktop charging station with Bluetooth APP control**: Requires evaluation, and most likely requires ANATEL. Need to verify the Bluetooth standard, frequency band, and power. Common misconception: Thinking that only those connected to cellular networks need it, but in fact, short-range wireless communication such as Bluetooth should also be evaluated according to ANATEL’s relevant product categories.
3. **Qi wireless charging pad for power supply only**: Requires further confirmation, cannot be directly said to be required, nor can it be directly said to be exempt. Need to verify the working principle, frequency, transmission power, product classification, and whether it meets the applicable exemption conditions. Common misconception: Thinking that wireless charging that does not transmit data definitely does not need to be managed, but in fact, conclusions cannot be drawn solely based on “not transmitting data”.
4. **Power bank with Bluetooth and positioning function**: Requires evaluation, most likely requires ANATEL. Need to verify whether the positioning method is GPS or cellular, wireless standard, and power. Common misconception: Thinking that power banks only need to manage charging safety, but those with wireless functions must evaluate ANATEL according to relevant categories.
5. **Charging bin integrated with an approved Bluetooth module**: Requires evaluation of the integrated radio frequency characteristics, no automatic exemption. Need to verify the validity of the module ID, the complete machine’s antenna design, and whether the output power meets the module’s use conditions. Common misconception: Thinking that if the module has an ID, the complete machine does not need to be processed.
Quick Self-Check and Summary
Finally, we have sorted out a quick self-check list for you, you can check it off:
□ Whether the product has wireless communication, cellular access, or other functions that may be regulated by ANATEL; whether wireless charging products have been classified and evaluated according to specific technical solutions
□ Whether key parameters such as wireless standard, frequency band, power, and antenna have been collected
□ Whether a qualified local Brazilian applicant has been confirmed
□ Whether the product model and wireless configuration are within the Anatel ID registration and approval scope
□ Whether the product displays the Anatel ID or approval label as required
After reading this article, you should be able to independently do these 5 things:
1. Can use the four-step judgment method to preliminarily judge whether charging products need ANATEL evaluation;
2. Can distinguish the jurisdictions of ANATEL and INMETRO, to avoid missing certifications or wasting money;
3. Can verify the authenticity and status of the Anatel ID through ANATEL’s official channels;
4. Can state the general application process, core requirements, and factors affecting cycle and cost;
5. Can avoid common pitfalls in certification application, customs clearance, and e-commerce listing.
High-Frequency FAQ
**Does wireless charging definitely require ANATEL?**
Not necessarily. Wireless charging products cannot be judged solely based on “wireless” or “Qi”, and need to be evaluated in combination with the working principle, operating frequency, transmission power, product classification, as well as current technical requirements and exemption rules.
**Can FCC/CE reports replace ANATEL testing?**
They cannot directly replace ANATEL approval. Whether existing overseas test reports can be accepted must be confirmed according to applicable technical requirements, laboratory qualifications, report content, and OCD review results.
**If the wireless module has an Anatel ID, can the complete machine be exempted?**
It cannot be automatically exempted. It is necessary to evaluate whether the complete machine meets the use conditions specified in the module approval, and whether the antenna, power, and other radio frequency characteristics of the complete machine have changed. When conditions are met, simplified or module-based assessment arrangements may apply, but it cannot be directly regarded as exemption.
**Can you sell on Brazilian e-commerce without an Anatel ID?**
If the product legally falls within the scope of ANATEL mandatory approval, failure to obtain valid approval usually means it cannot be legally commercialized, and may be intercepted during import, market supervision, or platform review. For products that are not within the mandatory scope or are eligible for exemption, Anatel ID should not be used as a unified sales condition.
**Which should be done first, ANATEL or INMETRO?**
There is no fixed order, they can be promoted simultaneously. The two do not replace each other, and each applies for or confirms applicability according to its own requirements.
Overall, ANATEL product approval is a Brazilian access system for specific telecommunications products, wireless communication equipment, restricted radiation equipment, and other regulated products. For charging products, the core is not to look at power or USB interface, but to first confirm whether the product belongs to ANATEL’s regulatory category; wireless communication and cellular functions usually require key evaluation, while wireless charging must be judged in combination with specific technical solutions and current rules. When in doubt, it is a more reliable way to confirm with a professional organization authorized by ANATEL.