Why am I getting unlimited tethering?

[Android Central Question]

I always pay full price for my phone and never purchase inside a store. I am using ATT. A few years ago I purchased a Galaxy S8 and noticed I had unlimited tethering. Somehow ATT caught on and then I rooted the phone to continue unlimited tethering. About a week ago I ordered a Sony Xperia 1 from B&H. To activate the phone I swapped the some card from the S8 and activated the phone over the internet. Once again, the ATT app on my new phone shows a stagnant amount of tethering usage. I notice on the top left of the screen there is only a digital clock icon instead of an ATT icon. This is the second time this has happened. Has this happened to anyone else?

 

[belodion]

If you're rooting to conceal data usage, that would surely be a breach of contract by you. PM me if I'm wrong about that. Meantime I'll close the thread. It can easily be reopened if I am wrong.