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Im
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Ratings have been developed for mobile phones to assist 
hearing device users find phones that may be compatible with 
their hearing device. Not all phones have been rated for 
compatibility with hearing devices. Phones that have been 
rated have a label located on the box. 
Your SPH-M350 has an 
M4 rating
.
These ratings are not guarantees. Results will vary depending 
on the user’s hearing device and individual type and degree of 
hearing loss. If a hearing device is particularly vulnerable to 
interference noise; even a phone with a higher rating may still 
cause unacceptable noise levels in the hearing device. Trying 
out 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 for 
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.)
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 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.
We 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. 
Getting the Best Hearing Device 
Experience With Your Phone
To further minimize interference:
Set the phone’s display and keypad backlight settings to 
ensure the minimum time intervals.
1.
Press 
 
and touch
 Settings/Tools > Settings > 
Display > Brightness
, or 
Dim
.
2.
Touch the minimum time interval setting.
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.
M350.book  Page 141  Friday, October 8, 2010  2:51 PM