Apple E2380A Manuel D’Utilisation

Overview

Hearing Aid Compatibility (also known as HAC mode) is a feature that requires digital wireless
phones to be compatible with hearing-aids as indicated in FCC’s CFR Title 47 § 20.19. This
feature is intended to ensure that consumers with hearing disabilities have reasonable access
to telecommunication services when using Apple’s iPhone 4.
HAC mode feature is part of Apple’s iOS 5.0 software release for the iPhone 4. No additional
software installation is required.

Implementation

For the iPhone 4 and iOS 5.0 software release, the HAC mode feature is enabled through the
use of a Hearing Aid Mode switch. For any “Out-of-the-box” device, the Hearing Aid Mode
switch is set to OFF. A User can always enable this feature when required.
When the Hearing Aid Mode switch is set to ON and when the device is in a normal voice
call, it will reduce the maximum transmit power by 2.5 dB in GSM operations in the 1900
MHz band.
For any emergency calls, when the Hearing Aid Mode switch is set to ON, there is no
reduction of the maximum transmit power.
The reduction of maximum transmit power in this band may affect the GSM cellular coverage
in some areas.

The Hearing Aid Mode switch can be found in the User Interface of the iOS 5.0 software
release, at the following location:

Settings --> General --> Accessibility --> Hearing Aid Mode --> On/Off

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