I can not use Facebook, Gmail, World Wide Web and others if I put my Data Roaming on. I've accidentally choosen that Facebook and others only work on WLAN.
Somebody who knows how to unchange that decision?
For data the permission management is quite irrelevant. As i wrote earlier go to security - data usage!
"Data usage" in "security" have two sections, first one as you can see in the picture is for "downloaded apps", the second one is next to that labeled just "apps". You definitely have allowed 3g in these "apps"? Please check it.