Solved! How to use at&t sim in an unactivated simple moble zte z557bl phone

[travmorgan28]

I bought a zte z557 for simple mobile under impression it would work on my area well it doesn't and I can't get refund is there a master code to reseit. it has different preference on preferred networks in settings gsm lte cdmca I'm lost

 

[rgd1101]

read their unlock policy
https://ww2.simplemobile.com/termsandconditions