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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.
Several solutions for white screen on se w850i -Solution white screen with hang problem = reflash with the same CID firmware. -Solution white screen ,but can make a phone call = replace the flexible cabel or / and lcd.
If you try it, SEtool can very easily unlock a W810, I have done it without any problems. The problem is the new security on the phones. The platform is now what is called DB2020, and these phones cannot be unlocked. All new s are the same, so you cant unlock K800/K790 onwards unfortunatly.
Mine also happened like that. Diagnosed by authorized SE service station, the half-to-half cable, which connect the upper part (screen part) of the phone and the lower part (key pad), is damaged. But first, try to reinstall the operating system at SE service station.
Hope this helps you.