Yes, I live in Thailand now. I ported to Tello because after 90 days in Thailand T-mobile will cut you off if you're living here and they won't tell you when they do. Tello has worked with my US credit union credit card so far. It's only been a month, but from everything I have read, it's the way to go. I need 2fa so it's the way to go as far as I have seen. It also saves me $80 a month compared to what T-mobile charged up to the point of them canceling me. I only use my US number for TSP authentication. TSP won't do email authentication without a huge runaround.
I remember a couple of years ago that a western guy was in trouble for serving chicken at his wife's shop. All it takes is one competitor or jealous business owner to ruin your stay here.
when I did the 90 day non-o in Washington using the L.A. office it took about 10 days for an approval. When I did it in Laos , they killed it in 4 days and that was ony because I didn't send what they needed. If I had I, truly believe it would have been accomplished the same day. I did have a problem with my files being to big and I found a file compressor online for free that made it work. If I had that knowledge ahead of time I could have saved so much time. Best of luck to you.
just out of curiosity, how long will you stay here? Before I moved over in June, I asked how long I could keep my account active (T-Mobile) and they told me that after 90 days they would shut it down with no warning. I ported my number to Tello and I haven't had any problems, granted I just recently did it here in Thailand.