by your network operator. You can edit your PIN and select a new four- to eight- digit PIN.
If the message Codes do not match
appears when you edit your PIN, you entered the new PIN incorrectly.
If the message Wrong PIN appears, followed by Old PIN:, you entered your old PIN incorrectly.
To unblock your SIM card
1When PIN blocked appears, enter your PUK } OK.
2Enter a new four- to eight-digit PIN } OK.
3Re-enter the new PIN to confirm } OK.
To edit your PIN
1} Settings } the General tab } Security } Locks } SIM protection } Change PIN.
2Enter your PIN } OK.
3Enter a new four- to eight-digit PIN } OK.
4Re-enter the new PIN to confirm } OK.
To turn the SIM card lock on or off
}Security } Locks } SIM protection
}} Protection and select On or Off.
2Enter your PIN } OK.
Phone lock
Protect your phone against unauthorized use if it is stolen and the SIM card is replaced. You can change the phone lock code (0000) to any four- to
Automatic phone lock
If the phone lock is set to automatic, you do not need to enter your phone lock code until a different SIM card is inserted in the phone.
It is important that you remember your new 
code. If you forget it, you have to take your phone to your local Sony Ericsson retailer.
To set the phone lock
}Security } Locks } Phone protection
}Protection and select an alternative.
2Enter the phone lock code } OK.
To unlock the phone
If the phone lock is on, enter your code } OK.
To edit your phone lock code
}Security } Locks } Phone protection
}Change code.
78More features
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