Sanyo Vero User Manual page 123

Phones rated M3 or M4 meet FCC requirements for
M-Ratings:
hearing aid compatibility and are likely to generate less
interference to hearing devices than unrated phones. (M4 is the
better/higher of the two ratings.)
Phones rated T3 or T4 meet FCC requirements and
T-Ratings:
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. 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.
Sprint further suggests 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 within
30 days of purchase. (A restocking fee may be applied to
exchanges. Visit
www.sprint.com/returns
information about hearing aid compatibility may be found at: 
, , and
www.fcc.gov www.fda.gov
Getting the Best Hearing Device
Experience With Your Phone
To further minimize interference:
Set the phone's main screen and keypad backlight settings
to ensure the minimum time interval (see also page 29):
> Settings > Display > Backlight > 
1.
Press
Backlight Dim or Backlight Off
2.
Highlight the minimum time interval setting and press
Position the phone so the internal antenna is farthest from
your hearing aid.
Move the phone around to find the point with least
interference.
4A. Important Safety Information
for details.) More
.
www.accesswireless.org
.
.
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