Samsung SGH-X640 Manual De Usuario

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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.

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.

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 and Combined GSM 900/1800.
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.

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.