Following a network refresh I'd like you to now restart the handset. It should connect to the network automatically but sometimes a manual search and select is needed (Google how to do this if you're not sure).
If you want to use your data allowance abroad then you need to make sure data roaming is active on the handset itself. The basic instructions for doing this can be found here.
If your data still doesn't work then you just need to update the APN settings of the handset. You can enter them manually by looking here or you can select your handset from the list here and you'll get the update directly.