Sony Ericsson K310 - To unblock your SIM card

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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 eight-digit PIN.
To unblock your SIM card
1 When PIN blocked is displayed, enter your PUK } OK.
2 Enter a new four- to eight-digit PIN } OK.
3 Re-enter the new PIN to confirm } OK.
To edit your PIN
1 } Settings } General } Locks } SIM lock } Change PIN.
2 Enter your PIN } OK.
3 Enter a new four- to eight-digit PIN } OK.
4 Re-enter the new PIN to confirm } OK.
To turn the SIM card lock on or off
1 } Settings } General } Locks } SIM lock } Protection
and select On or Off.
2 Enter your PIN } OK.
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.
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