Samsung SGH-X640 Manual De Usuario

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Use this menu to reset the phone to its default 

settings. 
1. Select a setting category.
2. Press <Yes> to confirm the reset.
3. Enter the 4- to 8-digit phone password and press 

<OK>.

To save the time and expense of an unnecessary service 
call, perform the simple checks in this section before 
contacting a service professional.

messages may appear:
“Insert SIM”
• Be sure that the SIM card is correctly installed.
“Phone lock Enter password”
• The automatic locking function has been enabled. 

You must enter the phone’s password before you 

can use the phone.

“Enter PIN”
• You are using your phone for the first time. You 

must enter the PIN supplied with the SIM card.

• The PIN Check feature is enabled. Every time the 

phone is switched on, the PIN has to be entered. 

To disable this feature, use the PIN check menu.

The password is preset to 00000000. You can 

change this password.