I used it in France a few weekends ago and it worked perfectly. Got a text from 3 when I got home saying I'd saved £30 due to FAH.
Thanks how did you set it up within the phone i take it you wait until your abroad and go settings mobile network settings and click data roaming to on?
You will miss the speakers imo.
I'm deaf in one ear and don't find myself playing music from my phone that often anyway (that's not through headphones). between this and the added expense of an S6 i think...