Samsung SGH-X640 用户手册

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Use this menu to protect the phone against 

unauthorised use by managing the several access 

codes of your phone and SIM card.     

The 4-to 8-digit PIN (Personal Identification Number) 

protects your SIM card against unauthorised use. 

When this feature is enabled, the phone requires your 

PIN each time it is switched on.
Change PIN

Use this menu to change your PIN. The PIN Check 

feature must be enabled to use this feature.
Phone lock

The Phone lock feature locks the phone from 

unauthorised use. 

When this feature is enabled, you must enter a 4- to 

8-digit phone password each time the phone is 

switched on.
The password is preset to 00000000. To change the 

password, use the Change password menu.
Change Password 

Use this menu to change your phone password. The 

password is preset to 00000000.
Privacy  

Use this menu to lock your media contents, including 

MMS messages, voice memos, images, and sounds. 
1. Press <Select> to check the item(s) to be locked. 
2. Press <OK> to lock the marked items.
3. Enter the phone password and press <OK>.
To access a locked item, you need to enter the phone 

password.
SIM lock

The SIM lock feature allows your phone to work only 

with the current SIM by assigning a SIM lock code. You 

If you enter an incorrect PIN /PIN 2 three times in 

succession, the SIM card is blocked. To unblock it 

you need to enter your PUK/PUK2 (Personal 

Unblocking Key). The codes are supplied by your 

network operator.