yeah I had something similar, but 15 Mb per second doesn’t cut it for me.! Mine was super fast speed and unlimited data With about 360 minutes of calls 
I tried with AIS, but when I went to do the eSIM I would select my phone number Online then it take me to the next screen. I take a photo of my passport and then it would say too bad, phone number no longer available try again. So I’d go back and choose a different random phone number go ahead take a photo of my passport again for the same problem of phone number no longer available. So I just gave in and went to dtac