Zte C76 Quick Start Manual page 41

M-Ratings: Phones rated M3 or M4 meet FCC requirements and are likely to
generate less interference with 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 be
more usable with a hearing device's telecoil ("T Switch" or "Telephone Switch")
than unrated phones. T4 is the better/higher of the two ratings. (Note that
not all hearing devices contain telecoils.) The more immune your hearing
aid device is, the less likely you are to experience interference noise from
your wireless phone.
Hearing devices may also be measured for immunity to this type of interference.
Your hearing device manufacturer or hearing health professional may help
you find results for your hearing device.
For additional information about the FCC's actions with regard to hearing aid
compatible wireless devices and other steps the FCC has taken to ensure
that individuals with disabilities have access to telecommunications services,
please go to www.fcc.gov/cgb/dro.
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