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How I can unlock my sonny ericsson txt (ck13i). I need phone lock code
If the phone is locked with a phone lock code you need to have the phone sent to service to get it unlocked. Please contact your local Xperia support team for more information:
http://www.sonymobile.com/global-en/support/contact-us/
Also you could try with the default code 0000. But if the code have been changed you need to contact a service center.
If it is network locked,You could purchase such network phone lock code from any vendors online like ClassicUnlocking.com
You ask your network provider.