Have some phones bought from Cricket. Wanted to port them to Spectrum (Verizon). Was told they couldn't be moved and I would need new phones so I didn't make the switch. Apparently all the carriers put something in their phones so you can't move them. The phones are unlocked - we used them with other sim cards in Belize. I recall buying phones from Best Buy several cycles ago for use with ATT. ATT had some feature (think it might have been wifi calling before it became more widespread) and I couldn't do it because only the phones (of that particular model at least) that were bought from ATT could do it. So I need to do some more reading. Read something about carrier locks and SIM card locks. I think you save a little money buying phones from the carrier but may not do that next time.