If you have previously used this phone abroad and had a local network connection, try connecting to an alternative local network - unless you have explicitly requested roaming is cancelled, it would not have been. Either toggle flight mode or use your phone's network selection menus to manually choose another operator.
EE's roaming services allow you to connect to foreign networks, which self-evidently here is setup. All CS are likely to suggest is to try another local network and see if the symptoms are the same.
