I had few problems in Argentina and Uruguay (only countries I've been to since I got it, but been to several times). In the norhern part of Argentina (Iguazu) I had poor coverage where my girlfriend had (Argentinian service provider) great coverage. I think Fi was trying to decide if I was in Brazil or Argentina and that was messing me up. In Buenos Aires (where I spent most of my time), reception was good except for around some buildings (assuming line-of-sight issues). In Uruguay I never had any problems.

The only other issues were a lag between landing and service beginning. Took over half an hour on one trip, and over an hour on another. But this year I didn't have that lag, took maybe 5 minutes from when I turned on the phone after landing to it working.

Service speed was always good.

NB: I have a Nexus 5X. Some of the reception issues may have just been reception issues with that device compared to others, I don't know.

Great in my experience (Austria, Germany, Switzerland, France, UK, Canada, Thailand, South Korea). I found it to always be fast with no obvious throttling, and coverage is often better overseas than at home.

They are native speeds, or at least so fast that they might as well have been. I was seeing > 60mbit in Germany.