Samsung SGH-E316CSAAWS - Manual (Page 146)

Network Services
142
If you select Automatic, you are connected to the first
available network when roaming.
If you select Manual, the phone scans for the available
networks. Go to step 3.
3. Press the Up or Down key until the network you
want highlights and then press the OK soft key.
You are connected to that network.
Caller ID
You can prevent your phone number from being
displayed on the phone of the person being called.
Note:
Some networks do not allow the user to change this setting.
The following options are available:
Default: the default setting provided by the network is
used.
Hide Number: your number does not display on the
other person’s phone.
Send Number: your number is sent each time you
make a call.