I was on a pre-paid plan from Oct 2014-Feb 2017 with Stateside International Talk. I travel internationally frequently, and when abroad, while I would not get access to phone/internet on cellular, when connected to Wifi, T-mobile wifi would show up as the carrier, and I could make calls/send texts etc.
I used to call India (one of the countries included in Stateside International Talk) as well from my pre-paid number when roaming and on Wifi, and I never got charged ANYTHING extra.
I recently upgraded to T-mobile One postpaid plan, with One Plus and Stateside International Talk. Last month when in India, I tried doing the same (make calls to an Indian number on wifi), but saw that I have been billed $0.20 per min. Why is this discrepancy between prepaid and postpaid? I find it hard to fathom that I am paying more for my postpaid service than my prepaid but I am getting charged for something that was basically free when I was a prepaid customer.
Can an expert here help me out on this please? Thanks!
PS: I tried calling customer support, and while they were very helpful, their knowledge was restricted to postpaid plans. They didn't know how prepaid billing worked, which is why I am posting here in the hopes of getting an authoritative clarification.