Assistive technology is constantly evolving and CusterTel understands the importance of being able to stay in touch with friends and family. We are committed to providing the latest technology to our customers to address their specific needs, whether it is using a device that offers hearing aid compatibility or the ability to reach out using alternate methods.

DeviceRatingFCC ID
Apple iPhone SEM3/T4BCG-E3500A
Apple iPhone MiniM3/T4BCG-E3539A
Apple iPhone 12M3/T4BCG-E3305A
Apple iPhone 12 ProM3/T4BCG-E3545A
Apple iPhone 11 Pro Max-64MbM3/T4BCG-E3306A
Apple iPhone 12 Pro Max-128MbM3/T4BCG-E3548A
Samsung A32M3/T4A3LSMA326U
Samsung A42M3/T4A3LSMA426U
Samsung S21M3/T4A3LSMG991U
Samsung S20M3/T4A3LSMG981U
Samsung Galaxy Z Flip3M3/T4A3LSMF711U
Last Updated 1/25/2022

All phones have been tested and rated for use with hearing aids for some of the wireless technologies that they use. However, there may be some newer wireless technologies used that have not been tested yet for use with hearing aids. It is important to try the different features of a phone thoroughly and in different locations, using your hearing aid or cochlear implant, to determine if you hear any interfering noise. Consult your service provider or the phone manufacturer for information on hearing aid compatibility. If you have questions about return or exchange policies, consult your service provider or phone retailer.

Hearing Aid Compatibility

The FCC has established rules regarding Hearing Aid Compatibility (HAC), which all wireless carriers must follow. HAC ratings were developed to assist hearing device users in finding handsets that may be compatible with their hearing devices. Handsets must meet or exceed the ANSI (American National Standards Institute) ratings to meet the FCC requirements for Hearing Aid Compatibility. There are two standards or ratings. 

M Rating

Wireless phones which have an M3 or M4 rating meet the FCC requirements to be compatible with hearing devices which operate in acoustic coupling mode, also referred to as microphone mode. These devices amplify all sounds surrounding the user, both desired and undesired. A phone with an M3 rating meets the HAC requirement set by the FCC. A phone with an M4 rating exceeds the HAC requirement.

T Rating

Phones that are designated T3 or T4 meet FCC requirements to be compatible with hearing devices which operate in inductive coupling or telecoil coupling mode. These hearing devices avoid unwanted noise by turning off the microphone and using a telecoil, which picks up magnetic fields generated by the phone and converts them to sound. A phone with a T3 rating meets the HAC requirement set by the FCC. A phone with a T4 rating exceeds the HAC requirement.

For additional information regarding HAC devices and other accessibility features, please visit

For more information about the FCC’s rules and service provider obligations, see