Apple iPhone 4G - Manual (Page 247)

Hearing Aid Compatibility
The FCC has adopted hearing aid compatibility (HAC) rules for digital wireless phones.
These rules require certain phones to be tested and rated under the American National
Standard Institute (ANSI) C63.19 hearing aid compatibility standards. The ANSI standard
for hearing aid compatibility contains two types of ratings: an “M” rating for reduced
radio frequency interference to enable acoustic coupling with hearing aids that don’t
operate in telecoil mode, and a “T” rating for inductive coupling with hearing aids
operating in telecoil mode. These ratings are given on a scale from one to four, where
four is the most compatible. A phone is considered hearing aid compatible under FCC
rules if it is rated M3 or M4 for acoustic coupling and T3 or T4 for inductive coupling.
For current iPhone hearing aid compatibility ratings, go to
www.apple.com/iphone/specs.html.
Hearing aid compatibility ratings aren’t a guarantee that a particular hearing aid works
with a particular phone. Some hearing aids may work well with phones that don’t
meet particular ratings. To ensure interoperability between a hearing aid and a phone,
use them together before purchasing them.
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.
247 Chapter 29 Accessibility