Hearing Aid Compatibility (HAC)

February 6, 2024

HAC is best described when mobile phones and hearing devices (hearing aids and cochlear implants) are used together the result is buzzing, humming or whining noises that are detected by the user. Some hearing devices are more immune than others to this interference noise, and phones also vary in the amount of interference they generate.

The wireless telephone industry has developed two types of ratings for mobile phones to assist hearing device users in finding phones that may be compatible with their hearing devices.

Phones rated M3 or M4 meet FCC requirements and are likely to generate less interference to hearing devices than phones that are not labeled. M4 is the better/higher of the two ratings

Phones rated T3 or T4 meet FCC requirements and are likely to be more usable with a hearing device’s telecoil.

Basic Phone
Basic Handsets are phones that typically provide voice calling and text messaging functionality as well as basic multimedia and internet capabilities.

Smartphones are mobile phones that perform many functions of a computer. Typically have a touch screen, can access the internet and have an operating system capable of running applications.

It is important to try the different features of any phone thoroughly and in different locations, using your hearing aid or cochlear implant, to determine if you hear any interfering noise. Consult with NVC or the manufacturer of the phone for information hearing aid compatibility.

For more information about phone accessibility features, as well as information about current and older phones, visit www.gari.info.

For additional information about hearing aid compatibility with digital wireless phones, visit www.fcc.gov/general/hearing-aid-compatibility-hac.

HAC Ratings 

Phone Models

Model Name




Functionality Level

Samsung SM-S921U S24 A3LSMS921U M3 T3 Smartphone
Samsung SM-S926U S24+ A3LSMS926U M3 T3 Smartphone
Samsung SM-S928U S24 Ultra   A3LSMS928U M3 T3 Smartphone
Samsung SM-F926U1 Galaxy Z Fold3 A3LSMF926U1 M3 T3 Smartphone
Samsung SM-S901U S22 5G A3LSMS901U M3 T3 Smartphone
4058G TCL Flip Go 2ACCJN059 M4 T4 Basic
Samsung SM-S911U1 S23 A3LSMS911U M3 T3 Smartphone
Samsung SM-S916U1 S23+ A3LSMS916U M3 T3 Smartphone
Samsung SM-S918U1 S23 Ultra A3LSMS918U M3 T3 Smartphone
Samsung SM-A546U1 A54 A3LSMA546E M3 T3 Smartphone
Samsung SM-A156U1 A15 ZCASMA156U M3 T3 Smartphone


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