Samsung SGH-X640 User Manual page 49

Menu functions
Network selection
This network service allows you to either automatically
or manually select the network used when roaming
outside of your home area.
You can select a network other than your home
network only if there is a valid roaming agreement
between the two.
• Automatic: connect to the first available network
when roaming.
• Manual: select the network you want.
Caller ID
(Menu 3.5)
This network service allows you to prevent your phone
number from being displayed on the phone of the
person being called. However, some networks do not
allow the user to change this setting.
• Default: use the default setting provided by the
network.
• Hide number: ensure your number does not
display on the other person's phone.
• Send number: send your number each time you
make a call.
46
(Menu 3.4)
Band selection
(Menu 3.6)
For the phone to make and receive phone calls, it
must register with an available network. Your phone
can handle any of the following types of networks:
GSM 1900, Combined GSM 900/1800 and Combined
GSM 900/1800/1900.
The country where you purchased your phone
determines the default band that it uses. When you
travel abroad, you must remember to change to an
appropriate band.
When you select a new band, your phone
automatically searches for all available networks. Your
phone registers with a preferred network within the
band.
Active line
(Menu 3.7)
Some SIM cards may be used with two subscriber
numbers. Use this menu to select the line to be used
to make calls, if your SIM card supports two numbers.
Calls come in on both lines, regardless of the
selected line.