Standard Institute (ANSI) C63.19-2011 hearing aid
compatibility 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
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
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