Zte Warp 7 User Manual page 6

and are likely to generate less interference
to hearing devices than unrated phones. (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.)
Note: New Technologies, Including Wi-Fi
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 newer wireless technologies
(including Wi-Fi) used in this phone that have
not been tested for use with hearing aids.
Hearing aid devices may also be measured
for immunity to interference noise from
wireless phones and should have ratings
similar to phones. Ask your hearing healthcare
professional for the rating of your hearing aid.
6
Add the rating of your hearing aid and your
phone to determine probable usability:
Any combined rating equal to or greater
+
than six offers excellent use.
Any combined rating equal to five
+
is considered normal use.
Any combined rating equal to
+
four is considered usable.
Thus, if you pair an M3 hearing aid with an M3
phone, you will have a combined rating of six for
"excellent use." This is synonymous for T ratings.
It is further suggested you experiment with
multiple phones (even those not labeled M3/
T3 or M4/T4) while in the store to find the one
that works best with your hearing aid device.
Should you experience interference or find the
quality of service unsatisfactory after purchasing
your phone, promptly return it to the store.
Important Safety Information