Locked Nokia Lumia 520

You need to get an unlock code and a non AT&T SIM if you don't get the unlock code from AT&T.
 
AT&T give the code only after 6 months.

Then you need to purchase an unlock code if you want it sooner. There's no other way as far as I know. You could try searching on this forum as this is a topic that's been discussed before.
 
Well now you know to avoid AT&T locked phones because they do what they can to avoid unlocking them.

in short, the easiest method probably is to sell that phone and get an unlocked one.
you may never get that unlocked, its a strong possibility, or it will cost more than the phone.
 

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