If I buy an at&t iphone can I flash it to another company?

I bought an at&t iphone and I want to flash it to another company. I think I read that I can't flash it to sprint, Verizon, or Cricket. But can I flash it to T mobile or the walmart plans? (Family mobile) What can I do?

Yes it can be unlocked for tmobile, simple mobile, etc
any gsm carrier

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