@Garrett **********
it's prepaid top-up number but with a balance displayed on the DTAC app. I would imagine a post-paid subscription would have more options and might work, in fact, I could try to change to post-paid while in the USA (DTAC app advertises that), but it's not that urgent for me and not sure if that would solve it, probably would have a second step of subscribing to a roaming service.