Need to kniw about sim cards.

Jul 9, 2018
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I have a boost zte n9560 and would like to put my att Sim card in it to use. However I can't get past the Google log in. There is another account on that is synced to the phone and it won't let me put my info in. How can I fix this.
 
Solution
The previous owner has to remove the phone on his google account or you have to remove the old phone from your account before using the old Sim card.