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Home  »  Hearing Aid Compatibility Info


Hearing Aid Compatibility with Wireless Handset Devices

A hearing aid operates by using a microphone to pick up sound waves in the air and convert the sound waves to electrical signals. The signals are then amplified as needed and converted back to audible sounds for the user to hear. The hearing aid's microphone, however, does not always work well in conjunction with audio devices like headsets and telephone handsets. The acoustic connection made between the audio device and the hearing aid is poor and creates distortions in the sound. In addition, the surrounding noise in the area of the user is often picked up by the hearing aid and interferes with the desired audio.

ANSI Standards

Uniform methods of measurement are set forth using the American National Standards of Measurement Compatibility between Wireless Communications Devices and Hearing Aid Standards, ANSI C63-2007.

Microphone Standard

NDNC offers wireless handsets that meet or exceed the ANSI (American National Standards Institute) hearing aid compatibility standard. Handsets that receive a hearing aid compatibility rating of M3 or M4 have met or surpassed the ANSI hearing aid compatibility standard as adopted by the Federal Communications Commission.

  • M3-rating indicates the handset has satisfied the ANSI standard
  • M4-rating indicates the handset has exceeded the ANSI standard

M3/M4 Rating Description - The higher the M-rating the handset has the lower the Radio Frequency emissions level and higher signal quality the handset will have. If there is no M-rating then the handset does not meet the ANSI standard. The handset's M-rating along with a hearing aid's M-rating will assist customers in finding a handset that will work best for them. The hearing aid must be in microphone mode in order to replicate the mode that was used with the handset when the rating was achieved.

The M-rating, and a brief description of what the M-rating means, will be on the outside of the handset box. ANSI rating descriptions will also be included in the welcome packet received at the time of service activation.

 This phone has been tested and rated for use with hearing aids for some of the wireless technologies that it uses.  However, there may be some newer wireless technologies used in this phone that have not been tested yet for use with hearing aids.  It is important to try the different features of this thoroughly and in different locations, using your hearing aid or cochlear implant, to determine if you hear any interfering noice.  Consult your service provider or the manufacturer of this phone for information on hearing aid compatibility.

Telecoil Standard

NDNC offers handsets that meet the ANSI (American National Standards Institute) Telecoil standard. Handsets that receive a telecoil rating of a T3 or T4 have met or surpassed the required standard as adopted by the Federal Communications Commission.

  • T3-rating indicates the handset has satisfied the ANSI standard
  • T4-rating indicates the handset has exceeded the ANSI standard

T3/T4 Rating Description - The telecoil rating is in reference to telecoils in some hearing aids, the telecoil is a small device that is built into some hearing aids for use with the telephone as well as assistive listening devices. Not all hearing aids have telecoils. To use the telecoil, generally, either the hearing aid is switched to the "T" position or a button on the hearing aid is pushed to select the telecoil setting.

The telecoil picks up magnetic fields generated by telephones and converts these fields into sound. Telecoils are particularly useful for telephone communication because they permit the volume control of a hearing aid to be turned up without creating feedback or "whistling," and background noise can be reduced, especially when using cell phones in noisy places.

The handsets that are both compliant for the microphone rating and the telecoil ratings will have both ratings on the handset box. ANSI rating descriptions will also be included in the welcome packet received at the time of service activation. If compliant to both standards it will appear as M3/T3 or M4/T4.

Hearing Aid Compatible Phones

SRT Wireless currently sells numerous phone models that meet the FCC M and T rating standards. For more details on devices, please view our on-line store and select phones of interest, see the M and T rating, or visit the SRT Connections store to view and test our devices.

Review the following list of all SRT Wireless devices that are rated for hearing aid compatibility.


Feature PhonesRating
Sonim ShieldM4, T3
Kyocera DuraXAM4, T4
Sonim Enduro M4, T4
LG Fluid II M4, T4
Samsung Galaxy S5M4, T4
iPhone 6sM3, T4
iPhone 6s PlusM3, T4
iPhone 6 PlusM3, T4
iPhone 6M3, T4
Samsung Galaxy Note 5M4, T3
iPhone 5sM4, T4
Moto GM3, T4 
Moto XM4, T4
Samsung Galaxy S6M4, T3
Samsung Galaxy S6 EdgeM4, T3

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SRT Communications located in Minot, North Dakota is the state's largest telephone cooperative. SRT has served the telecommunications needs of north central North Dakota since 1951, employs more than 200 people, and serves over 48,000 customers.

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