I have been using my data with no issues in Nederlands and Czech Republic over the past week. I then got to Rijeka in Croatia and my data wasn't working (by which I mean I had it turned on, roaming on but it was not showing 3G etc next to my signal bars despite having signal). I then got on a bus to Pula (also in Croatia) and it popped up, but disappeared when I arrived. I have tried turning data, roaming etc on and off, changing from 2G/3G/4G, resetting period, resetting phone and nothing. Any help would be greatly appreciated!