on your phone. If you enter the PIN incorrectly three times in a row, the SIM card is blocked. You need to enter your PUK (Personal Unblocking Key). Your network operator supplies the PIN and PUK.
To unblock your SIM card
1When PIN blocked appears, enter your PUK and select OK.
2Enter a new four- to
3
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 edit your PIN
1From standby select Menu } Settings
}the General tab } Security } Locks
2Enter your PIN and select OK.
3Enter a new four- to
4
To turn the SIM card lock on or off
1From standby select Menu } Settings
}the General tab } Security } Locks
3Enter your PIN and select OK.
Phone lockYou can stop the unauthorized use of your phone. 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
1From standby select Menu } Settings
}the General tab } Security } Locks
}Phone protection } Protection.
2Select an alternative.
3Enter the phone lock code and select OK.
To unlock the phone
•Enter your code and select OK.
60More features
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