Worked fine in Vienna and Prague.

In Vienna, it prefers to roam on T-mobile. But my AT&T iPhone connected to the A1 network most of the time, where the signal was stronger and often LTE.

I didn't try to force my iPad mini 2 to connect to A1 because t mobile was fine for the most part.

I took a long train from vienna to prague. MOst of the time between bigger cities, there was no signal or just EDGE. I did force the iPad to use O2, which is supposedly better in coverage. Iphone stayed on O2 by itself.

Both Austria and the Czech Republic are suppose to have reasonable prepaid options, like $10-13 for 1 GB. But for my use, which was mostly Google Maps while I was out, I made do with roaming at throttled speeds.

If I spent at least a week at each location, I probably would have splurged.