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• The FCC has adopted HAC rules for digital
wireless phones. These rules require certain
phone to be tested and rated under the
American National Standard Institute (ANSI)
C63.19-2011
hearing
standards.
• The
ANSI standard for hearing aid
compatibility contains two types of ratings.
• M-Ratings: Rating for less radio frequency
interference to enable acoustic coupling with
hearing aids.
• T-Ratings: Rating for inductive coupling with
hearing aids in tele-coil mode.
• Not all phones have been rated, a phone is
aid
compatibility
considered hearing aid compatible under FCC
rules if it is rated M3 or M4 for acoustic
coupling and T3 or T4 for inductive coupling.
These ratings are given on a scale from one to
four, where four is the most compatible. Your
phone meets the M3/T3 level rating.
• However, hearing aid compatibility ratings
don't guarantee that interference to your
hearing aids won't happen. Results will vary,
depending on the level of immunity of your
hearing device and the degree of your 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
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