

My phone at the time worked fine on 4G for over a year, but suddenly one day it no longer worked once they started enforcing this. I suspect the carrier wanted to collect a troll toll from phone manufacturers to allow them the privilege to sell a phone to their customers
Its certainly possible that they’re trying to extract a toll from handset manufacturers, but I could also see it being a spectrum consolidation. Can I ask if your OnePlus 5T was a model specifically made for the USA market or was it imported from China or Indian markets? I’ve seen non-domestic model phones not contain all the same radios as North American phones. So while its possible there were a few specific bands overlapping that allowed it to work, those bands could have been deprovisioned from phone service or sold off to other companies wanting to buy spectrum.



I’m seeing two models of the OnePlus 6T:
Are you aware of a different 6T model besides these two or are you saying there are 6T (A6013) that AT&T are rejecting from activating on their network?