Use wifi, have you checked your phone is enabled? Did you check before you went to see if roaming is active, contract phones are not automatically activated for roaming and if it's new less than three months old there may be a pre payment required.
Have you (providing the above have been met) carried out a manual network selection, if not try that
I hope that the trip has been good so far, I would like to ask if you have a data pass?
It's always best to check the APN settings here to see if things are as they should be. If you'd like I can make sure that it's all enabled this end but would need to ask for a few bits of info. If you can have a little look inside your 'Inbox', you'll see I've sent you a 'Private Message'. You can find this at the top right of the page, purple envelope