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4–34 User’s Guide
Using the Phone Features
Failed Automatic SIM Detection
If the SIM card is not detected by the application:
■ Check to see if the SIM card is present in the Pocket PC. If it
is not present, insert the SIM card and relaunch the
application.
■ If the SIM card is not recognized by the application, create a
new connection.
TTY Functionality for the Hearing-Impaired
NOTE: The TTY software application is included on the
Companion CD and must be downloaded onto the Pocket PC
before it can be enabled.
This Pocket PC supports TTY (Tele-typewriter) functionality.
This functionality allows hearing-impaired persons to
communicate using existing telephony infrastructure, including
cellular phones. To achieve this, separately purchased TTY
devices must be connected to the telephones on both ends of a
telephone call session, and the TTY software application must be
downloaded from the Companion CD onto the Pocket PC. The
sending TTY device generates a distinct audio tone for every
supported character, and these tones are decoded and converted
back into text on the receiving TTY device.
Due to the use of audio compression codecs in modern digital
cellular telephones, these TTY audio tones may be
unintentionally distorted while being transmitted through cellular
telephones. In order for TTY devices to continue to work in
cellular networks, the cellular telephone must be set into a mode
that optimizes the compression codec to handle TTY tones
instead of the human voice.
NOTE: For information on connecting TTY devices to the iPAQ
Pocket PC, refer to the TTY device manufacturer’s
documentation.