Recommendation for all: Go to mytmobile. Click on "Profile", then "Blocking". One of the options is to block "charge international roaming." It is described as "This will prevent the selected line from incurring any international data roaming charges that can be incurred in countries not included in plan."
Do it.
Originally Posted by
Fredd
I'll add a reminder from the problem I outlined up-thread. I thought I was safe on hotel wifi in the Maldives (a country not on the list) when I saw T-Mobile wifi displayed on the phone.
However, T-Mobile charged me as if I were using the Maldivian system. They kindly refunded my several-hundred dollar bill and confirmed that the way around that issue would be to use Skype or some similar calling program on wifi when in "outlier" countries.
A quick FWIW on the chance it's useful info for anybody.