Did you mean when calling customer service? if you have an online account or the Tmob aps, there's an option there to reset your PIN when calling customer care, the rep sent me a link on how to do it and that's how I changed mine... very helpful, I got the habit of changing mine every 3 months or so, you know for security reasons....😉
You might want to check with corporate stores; some of them offer instant trade in , while there are others who offer deffered trade in.....😉
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