Contact AT&T to determine their policy for unlocking your phone.
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No apology necessary. At the current time there is no officially unlocked iPhone sold in the US Apple Store. The GSM side of the Verizon iPhone X is unlocked per agreement with the FCC but currently you have to have service with Verizon or set up service prior to buying one. The T-Mobile model is unlocked. The AT&T model no matter where it is purchased is locked. If you pay full price you can go through AT&T to see if you can get it unlocked.
Question: iPhone x locked