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FCC Hearing Aid Compatibility (HAC) 
Regulations for Wireless Devices
On July 10, 2003, the U.S. Federal Communications Commission 
(FCC) Report and Order in WT Docket 01-309 modified the 
exception of wireless mobile devices under the Hearing Aid 
Compatibility Act of 1988 (HAC Act) to require digital wireless 
mobile devices be compatible with hearing aids.
The intent of the HAC Act is to ensure reasonable access to 
telecommunications services for persons with hearing 
disabilities. While some wireless mobile devices are used near 
some hearing devices (hearing aids and cochlear implants), 
users may detect a buzzing, humming, or whining noise. Some 
hearing devices are more immune than others to this 
interference noise, and mobile devices also vary in the amount of 
interference they generate.
The wireless telephone industry has developed a rating system 
for wireless mobile devices to assist hearing device users find 
mobile devices that may be compatible with their hearing 
devices. Not all mobile devices have been rated. Mobile devices 
that are rated have the rating on their box or a label located on 
the box.
The ratings are not guarantees. Results will vary depending on 
the user's hearing device and hearing loss. If your hearing device 
happens to be vulnerable to interference, you may not be able to 
use a rated mobile device successfully. Trying out the mobile 
device with your hearing device is the best way to evaluate it for 
your personal needs.
M-Ratings: Mobile devices rated M3 or M4 meet FCC 
requirements and are likely to generate less interference to 
hearing devices than mobile devices that are not labeled. M4 is 
the better/higher of the two ratings.
T-Ratings: Mobile devices rated T3 or T4 meet FCC requirements 
and are likely to generate less interference to hearing devices 
than mobile devices that are not labeled. T4 is the better/higher 
of the two ratings.
Hearing devices may also be rated. Your hearing device 
manufacturer or hearing health professional may help you find 
this rating. Higher ratings mean that the hearing device is 
relatively immune to interference noise. The hearing aid and 
wireless mobile device rating values are then added together.
A sum of 5 is considered acceptable for normal use. A sum of 6 
is considered for best use.