u/Left-Discount-8402

Got this card from a FedEx delivery driver and sent it to PSA and got a 10.

I have an iPhone on a payment plan. My phone is obviously locked to AT&T. It was replaced by Apple with a new device with my apple care plan. My new phone arrived and I went to pick it up and after transferring the number my new iPhone says no SIM restrictions. Can AT&T lock my phone after the fact?