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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.
If the phone lock code has been changed from the default 0000, or 1234, it would require the phones' software be flashed/wiped to factory default. There is no master code that would unlock the phone once a personal code has been entered.
You can try flashing the phone using the likes of wotanserver or davinci, or have it sent to sony ericsson for service.