Most SIM cards are locked at the time of purchase. If the SIM card lock is on, you have to enter a PIN (Personal Identity Number) every time you turn on your phone.
If you enter your PIN incorrectly three times in a row, the SIM card is blocked. This is indicated by the message PIN Blocked. To unblock it, you need to enter your PUK (Personal Unblocking Key). Your PIN and PUK are supplied by your network operator. You can edit your PIN and select a new four- to
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 } Locks } SIM Lock } 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
1 } Settings } the General tab } Locks } SIM Lock } 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 exchanged. 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 should forget it, you have to hand in your phone to your local Sony Ericsson retailer.
To set the phone lock
1} Settings } the General tab } Locks } Phone Lock } Protection and select an alternative.
2Enter the phone lock code } OK.
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