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68 Section 2D. Using Phone Features
Phone Services
When you are using your device in the United States, you can configure CDMA (domestic) phone services
for your device.
To access and change settings for domestic phone services:
1. From the Home screen, slide to the Settings tab and then tap All Settings.
2. On the Personal tab, tap Phone > CDMA Services tab.
3. Tap the service you want to change, and then tap Get Settings.
4. Tap ok after changing settings.
The following are some of the services that you can configure for your device:
For more information about customizing settings of phone services, see Help on your device.
Service Usage
Location Setting Allows the network to detect your current location using your device’s built-in
GPS chip. This is especially useful in emergencies.
TTY Mode Allows the use of a TTY (teletypewriter) device with the phone for users who are
visually or hearing impaired. Choose one of the following modes, depending on
the operation mode that is supported by the TTY device:
Full mode: Send and receive text during an ongoing call.
VCO mode: Voice Carry Over mode, which allows users to send voice and
receive text during an ongoing call.
HCO mode: Hearing Carry Over mode, which allows users to send text and
receive voice during an ongoing call.
Off: Disable TTY mode, and send and receive voice during an ongoing call.
Roaming To better control roaming costs, you can set your device to roam only on certain
networks. The Data Roam Guard also helps you to manage your roaming costs.
For more information about roaming, see “Roaming” on page 137.
Time Synchronization Allows the system time on your device to be synchronized with the time
information of the mobile phone network.
Voicemail Allows you to delete voicemail messages and clear the voicemail icon if it
appears on the screen.
Roaming Alert Enables sound alerts on your device so that you can be notified when your
device enters or goes out of the network coverage area.
DDTM Mode By default, voice calls take precedence over data. If, for instance, you are
browsing the Web or streaming media, the data connection may be interrupted
when you have an incoming call. To avoid interrupting the data connection, you
can turn on DDTM Mode so that voice calls can be automatically sent to
voicemail and the data connection will not be interrupted.