Huawei M881 Quick Start - Manual (Page 22)

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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 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 have telecoils in
them.) Hearing devices may also be measured.
Your phone meets the M4/T3 level rating. Hearing devices may also
be rated. Your hearing device manufacturer or hearing health
professional may help you find this rating.
This phone has been tested and rated for use with hearing aids for
some of the wireless technologies that it uses. However, there may
be some newer wireless technologies used in this phone that have
not been tested yet for use with hearing aids. It is important to try the
different features of this phone thoroughly and in different locations,
using your hearing aid or cochlear implant, to determine if you hear
any interfering noise. Consult your service provider or the
manufacturer of this phone for information on hearing aid
compatibility. If you have questions about return or exchange
policies, consult your service provider or phone retailer.
To ensure that the Hearing Aid Compatibility rating for your device is
maintained, secondary transmitters such as Bluetooth and/or Wi-Fi
components must be disabled during a call.
For more information about the FCC Hearing Aid Compatibility
please go to http://transition.fcc.gov/cgb/dro/hearing.html.