Have you tried the suggestions linked from here?
I followed all the steps in the troubleshooting guide multiple times but roaming NEVER works for me abroad. I get the error: You have lost data connectivity because you left your home network with data roaming turned off.
Anybody knows how to solve this?
Have you tried the instructions here?
Others have and it still didn't work but just linking them here in case you weren't aware and in the hope that you get some success from them...
My son was up north this week and nothing worked for him but he wasn't aware of this link...