Hi,
you can get the unlock code here http://www.onlinegsmunlock.com/ ..It provides unlock code and instructios...By using this u can unlock ur mobile easily...
SONY ERICSSON Z520A NEED UNLOCK CODE PLEASE
Call your service provider they should be able to unlock it for you. Or check online to see if there is a forum for your phone brand and model. So if you used google to do this your google search would look like this: Sony Ericsson Z520A Forum
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