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The PUK code or 'Personal Unblocking Key' is provided by your service provider, and can be used to unlock a phone after you have unsuccessfully attempted to access your phone using your password. This is an automated service in case you forget your cell phone password; the PUK code is usually valid for up to 28 days..
Your phone is not supported by the network as it is a locked set and will work only with the service provider where it was issued. Usually the unlocking codes are given after a lock-in period of one year and if so you can contact the service provider to get the unlocking pin.
If not check this link for help:
The phone lock code protects your phone against unauthorized use if it is stolen and the SIM card is exchanged. To be able to switch the phone on, you need to enter the four-digit phone lock code. The Sony Ericsson default phone lock code is '0000', but you can change this to any 4-8-digit personal code. When you buy the phone, the phone lock is by default turned off. Note: For security reasons, your operator, retailer or Sony Ericsson Contact Center cannot retrieve the lock code through the phone or the network. If you forget the code, locked phones must be sent to a service centre.