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Compatibility Act of 1988 (HAC Act) to require digital wireless
phones 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 phones 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 phones
also vary in the amount of interference they generate.
The wireless telephone industry has developed a rating system
for wireless phones, to assist hearing device users find phones
that may be compatible with their hearing devices. Not all
phones have been rated. Phones 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 phone successfully. Trying out the phone with
your hearing device is the best way to evaluate it for your
personal needs.
M-Ratings: 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.
T-Ratings: Phones rated T3 or T4 meet FCC requirements and
are likely to generate less interference to hearing devices than
phones that are not labeled. T4 is the better/higher of the two