Usually its 0000 but if your completely unsure you can just google the words sony ericsson manual and you should find somewhere a pdf document containing a digital copy of the problems and usual pin too,
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Delete some unnecessary files in your phone memory like images and videos. Go to your phone gallery and delete some of those. And if you want to use the memory card as phone message storage then go to Messaging - Option - Settings - Other and then Memory in Use, select your memory card.
But if your phone is infected with a virus then you need to format your phone. One sign of infection is your phone keep sending a message randomly from your contacts without your consent.
Use these code and enter it to format your phone: *#7370# and then the default code is 12345
Take note: Make sure you back-up your contacts or any other important inside your phone.
If you can switch on your phone, I would suggest you to plug it via USB t your PC and delete all the files in the phone/memory card...You can save the important files on your PC. After that, try to switch on and see if it works.