This is not clear on International High speed Internet or per minute calls. They had International included but at 2G speeds and $.020 per minute calls (Except Europe high speed for a period of time) and Mexico and Canada included. I wish they had a totally transparent plan for International with high speed as well
I believe it is 3G speeds. I have used this in the UK, Canada, Japan, Singapore and yes it is slow if you are trying to watch video but for google maps, iMessage, and email it is perfect. Your hotel/restaurant/coffee shop wifi will cover you for the rest and you call make calls on WiFi calling at no cost when conencted to WIFI.
For comparison, the evil empire, AT&T used to charge me 1.59 per minute unless I paid $15 a month for an international upgrade where I would pay 1.39! Data was by the KB and would KILL your bill. T-Mobile international, at least for me, is perfect.