H2O Sim inserted into full price BestBuy iPhone. Locked to AT&T. Cannot Unlock
I purchased an iPhone XS for the full price from BestBuy. I inserted an H2O sim into the iPhone and used it with calls and texts (did not have a data plan). In December, I noticed that I would get a cannot activate cellular network error on the phone when I attempted to use data. Due to upcoming holidays, I did not have enough days to probe this further. I left the US for my holidays and realized that the phone is locked when I attempted to swap SIMs.
I have been trying to get the phone unlocked via the AT&T website. The problem is that I get an error which states that the phone is active on another AT&T account.
I have already spoken to H2O customer support on this and they insist that they have no mechanism for locking or unlocking a phone as they are a prepaid carrier. The AT&T customer support insisted that they cannot help me and that I should get in touch with the device unlock team. I believe this is a consequence of the Apple US Flex retailer policy. My phone locked itself to AT&T because H2O used the AT&T network. I called Apple and they said that their system lists the iPhone as locked with AT&T. I would appreciate it if I can be put in touch with the AT&T device unlock team. I can provide proof that I paid for the phone in full. I have no contract with AT&T or H2O that requires payment. This is just an unfortunate consequence of the Flex Policy and I would appreciate some assistance in moving towards a solution. I am currently out of the US and will return to the US mid-January.
Note, I want to unlock this phone as I am an international studying in the US. It is important for me to be able to use the phone on different networks by just swapping the SIM.
P.S: I was misled by the BestBuy customer into believing this is an unlocked Apple iPhone (misfeasance or malfeasance, I cannot tell). Should have bought from the Apple website. I have been told and am acutely aware of my mistake.