Samsung SCH-3500 - Manual (Page 29)

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The three service modes are:
Automatic: The phone will search for digital service
first. If digital service is not available, it will search for
analog service automatically.
Sprint PCS: Service is limited to Sprint PCS Service, and
digital and analog roaming are not allowed.
Analog: The phone will acquire analog service, but will
revert to Sprint PCS or Automatic (depending on your
setting) at the next power-up.
To select the service mode:
1. Press to display the Main Menu.
2. Press for Roaming.
3. Press for Set Mode.
4. Press the scroll keys to scan options.
5. When the desired service mode displays, press
to save the setting or to exit without saving.
Roaming call guard.
Your phone can be set to display a message when a
roaming call is about to be placed or received.
To change your call guard setting:
1. Press to display the Main Menu.
2. Press for Roaming.
3. Press for Call Guard.
4. Select yes or no using the scroll keys.
5. When the desired setting displays, press to save
the setting or to exit without saving.