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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.
First of all, try to back up your info on your phone, i.e. save all your contacts to your SIM card, download SE PC Suite 4.0.10.00 from SE website, download MyPhoneExplorer 1.7.2 from Majorgeeks (all latest versions), and backup all info - rather 2 or 3 places than losing everthing! Download Update Service from SE website - follow instructions on screen. Even if you have the same / latest version firmware, re-install it. It solved all my problems - some same as yours.
Good luck. I now enjoy my SE W910i more than I did any other phone before.