Samsung SPH-A640ZKAAFT - Manual (Page 177)

Section 4A: Important Safety Information 155
Safety & W
a
rranty
Using Your Phone With a Hearing Aid
Device
Your Trumpet Mobile Phone has been tested for hearing aid device
compatibility. When some wireless phones are used near some hearing
devices (hearing aids and cochlear implants), users may detect a
buzzing, humming, or whining noise. Some hearing devices are more
immune than others to this interference noise, and phones also vary in
the amount of interference they generate.
The wireless telephone industry has developed ratings for some of their
mobile phones, to assist hearing device users in finding phones that may
be compatible with their hearing devices. Not all phones have been rated.
Phones that have been rated have label located on the box.
Your Trumpet Mobile Phone a640 by Samsung has an M3
rating
.
These ratings are not guarantees. Results will vary depending on the
level of immunity of your hearing device and degree of your hearing loss.
If your hearing device happens to be vulnerable to interference, you may
not be able to use a rated phone successfully. 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 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.)
The more immune your hearing aid device is, the less likely you are to
experience interference noise from your wireless phone. Hearing aid
devices should have ratings similar to phones. Ask your hearing
healthcare professional for the rating of your aids. Most new hearing aids
have at least an M2 immunity level. Add the “M” ratings of your hearing
aid and your phone to determine probable usability:
ⅷ Any combined rating equal to or greater than six offers best use.
ⅷ Any combined rating equal to five is considered normal use.
ⅷ 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 “best use.” This is synonymous for T ratings.