What PTCRB certification covers, and what your carrier adds on top

A cellular device needs PTCRB certification before carriers such as AT&T and T-Mobile will let it onto their networks. That certification tests the device against conformance specifications from the 3rd Generation Partnership Project (3GPP) and other standards bodies. It also requires an over-the-air (OTA) measurement of how well the device transmits and receives, but it sets no pass mark for that measurement.

Each of those carriers publishes its own pass marks outside PTCRB, so a device can hold a valid PTCRB certificate and still be refused by the carrier it was built for.

PTCRB is the certification program North American carriers set up in 1997 as a shared forum for checking that devices conform to the standards their networks run on. CTIA Certification administers it on the carriers’ behalf. Because the program belongs to the carriers rather than to a regulator, they enforce it on their own networks, where they can block uncertified devices. The legal requirement in the US is Federal Communications Commission (FCC) equipment authorization, which applies to every device regardless of the carrier.

PTCRB’s own requirements sit in NAPRD03, which lists the 3GPP and CTIA test specifications a device is tested against. NAPRD03 is released four times a year, and a device can only be certified against one of the two most recent versions, so the date it completes certification decides which versions apply. The process around those requirements sits in a second document, the PTCRB Program Management Document (PPMD), which runs from requesting certification to recertifying a device after a hardware or software change.

An IoT device built around a PTCRB-certified module or embedded modem goes through CTIA’s IoT Network Certified program instead, a streamlined route that runs on the PTCRB certification database and tests the device against NAPRD03 only in the areas the integration affects.

Conformance testing checks the radio, the signaling and how the device moves between cells separately, each against its own 3GPP test specification. Radio frequency (RF) conformance covers the radio, measuring the transmitter and receiver at the conducted level against 3GPP limits for each declared band: output power and power control, transmit signal quality, spurious emissions and receiver sensitivity.

Protocol conformance covers the signaling, from attaching to and detaching from the network to setting up connections and handing over between cells. Radio resource management (RRM) covers the movement between cells, testing how accurately the device measures nearby cells and how quickly it reselects them while idle, hands over while connected and detects a failing radio link. Alongside these conformance tests, NAPRD03 covers the SIM interface, radiated spurious emissions (unwanted signals the device radiates outside its channel) and optional features such as positioning.

Over-the-air performance is measured differently, on the whole assembled device in a chamber under the CTIA test plan, rather than at the antenna connector where the conducted RF tests are taken. It is reported as total radiated power (TRP), the power the device radiates across every direction when it transmits, and total isotropic sensitivity (TIS), the weakest signal it can still receive averaged over every direction. Both figures therefore reflect the antenna, the board and the enclosure together.

Building on a PTCRB-certified module cuts most of the conformance testing, but the device still needs a certification of its own.

The device is certified against the same NAPRD03 version its module was certified under, a version that stays valid for three years from the module’s last certification as long as the module runs the same software. After three years, either the module recertifies to the current version or you run the test cases added since then on your own device.

Under that version, most conformance results carry over from the module, whose manufacturer has to give your test lab every report behind its certification. The lab therefore typically limits the device’s own testing to OTA performance, a spot check of radiated spurious emissions, and the SIM interface where its wiring or power supply differs from the module’s. Conducted RF conformance joins that list only if the integration changes the module’s RF layout, components or shielding.

OTA performance, by contrast, is never inherited, because the antenna, ground plane and enclosure that set TRP and TIS belong to your device rather than to the module. It is also the result carriers put their own limits on.

PTCRB requires the over-the-air measurement and records the result, but it does not set a threshold that the result has to clear, so absolute pass marks come from the carriers, and each sets its own. AT&T publishes minimum TRP and TIS figures band by band for LTE Category 1 and higher, LTE-M, 5G NR and 5G Reduced Capability (RedCap), and a device has to meet them in every band its module supports. AT&T relaxes the LTE-M limits for devices under 107 mm in their longest dimension.

T-Mobile makes its own OTA performance criteria a condition of entry to its validation lab, on top of PTCRB certification, while Verizon measures radiated performance in a separate certification, Open Development, run in labs it authorizes. Open Development’s Fast Track route, for data-only devices built on a Verizon-approved module, takes a final PTCRB or Global Certification Forum (GCF) certificate together with RF OTA reports for all Verizon bands.

PTCRB applies a radiated limit of its own only after certification, when a hardware or software change to an IoT device leads the lab to retest it. The retested TRP can then be no more than 2 dB below the certified result, and the retested TIS no more than 2 dB worse.

NAPRD03 added requirements for satellite access through non-terrestrial networks (NTN) in June 2025. Three months later, version 6.22 added tests for RedCap devices from 3GPP Release 17 and removed the GSM tests.The PPMD dropped its own GSM requirements a month after that, so GSM is now out of the program entirely.

In the same October revision, the PPMD moved the certification requirements for IoT devices into the IoT Network Certified guide, so that guide is now the document an IoT team works from. NAPRD03 followed in December 2025 with an update covering both programs, and it has been revised twice since, up to version 6.25 in June 2026.

Testing happens at a CTIA-authorized lab, while the certification request, the documents and the fee go through the PTCRB certification database. The database also issues the device’s Type Allocation Code (TAC), the first eight digits of its International Mobile Equipment Identity (IMEI).

When you choose the lab, check that it covers every area your device needs, because labs differ in which test areas they are authorized for and CTIA keeps a separate list for OTA performance labs.

The lab runs the tests your device needs against the NAPRD03 version that applies to it. Results go back into the database with your supporting documentation, and once CTIA Certification has verified every requirement and the fee is paid, the device is certified.

For an IoT device, that fee is $1,500 for an initial certification and $1,000 for a variant, and the lab charges its own testing fees on top. CTIA publishes no standard timeline to go with those fees, since how long testing takes depends on its scope, which the lab sets from the bands your device declares and what it inherits from its module.

On a device built around a certified module, most of what the lab still tests is radiated, so the results depend on the finished assembly: antenna placement, the clearance kept free of components, copper and metal around it, the ground plane, the matching network, and where batteries and cables sit. By the time a device reaches a certification chamber the board is laid out and the enclosure is tooled, which leaves hardware changes as the only way to recover a radiated shortfall.

Pre-certification takes those measurements before the board is frozen. Ignion’s pre-certification service runs the same cellular over-the-air measurements the accredited labs run, on your assembled device, and reports TRP and TIS band by band against the carrier targets. Where a band falls short, Ignion’s RF engineers can retune the matching network. The PTCRB submission itself still goes through an accredited lab, since Ignion is not one.

Get your assembled device’s TRP and TIS measured while the layout can still change, through Ignion engineering support.

• What does PTCRB stand for?

PTCRB originally stood for PCS Type Certification Review Board, where PCS is the Personal Communications Service, the 1900 MHz band North American GSM networks used when the program started in 1997. The program has since outgrown that band, now covering 3G, LTE, 5G and satellite access, so the name no longer stands for its original meaning.

• Is PTCRB certification mandatory?

A cellular device needs PTCRB certification, or IoT Network Certified certification for an IoT device built on a certified module, to operate on carriers that use the program, such as AT&T and T-Mobile. The requirement comes from those carriers rather than from a regulator, so a device also needs Federal Communications Commission (FCC) equipment authorization by law.

• Does a PTCRB-certified module make my device certified?

A certified module shortens the work without removing it. Most conformance results carry over from the module’s test reports, but over-the-air (OTA) performance and a radiated spurious emissions check are always tested on the finished device, because its antenna, ground plane and enclosure set them. Those device tests run against the NAPRD03 version the module was certified under.

• Is PTCRB the same as GCF?

PTCRB and the Global Certification Forum (GCF) are separate certification schemes, with PTCRB run for North American carriers and GCF run by a partnership of mobile operators, device makers and the test industry. PTCRB does, however, accept GCF test results for bands outside its own list, provided a qualifying lab ran them and the PTCRB lab confirms they apply.

• Does PTCRB certification cover GSM?

GSM testing ended in September 2025, when PTCRB removed its GSM requirements from NAPRD03, the document that lists what gets tested. Since then, a new submission covers only the technologies still in the program that the device declares, such as LTE-M, Narrowband IoT (NB-IoT) and 5G.

• Can TRP and TIS be tested before PTCRB certification?

TRP and TIS can be measured on the assembled device before it goes to the accredited lab, while the layout can still change. Ignion’s pre-certification service does this by running the same cellular over-the-air measurements the labs run and reporting each band against the carrier targets, and where a band falls short, Ignion’s RF engineers can retune the matching network.