i called tmobile and they said that the international add on, only covers e-mail. The rep "noted" it in my account (urgh!). I'm traveling overseas in a few days and I was relying on the international plan for data, ( I was also going to tether it to my laptop). I'm using the $19.99 BIS plan. Has anyone on the BIS plan used the international add-on - if so were you charged for data?
This is an odd situation because I keep finding posts where people say that they weren't charged for the data, however they all seem to have BES.