I travel quite a lot abroad, and usually switch off mobile / cellular data when travelling due to high roaming charges for data. When I returned to the UK at the weekend, and took the phone off plane mode, it automatically re-enabled data when it connected to my home network (O2). It's never done that before. Turned off airplane mode and all my emails appeared out the blue. Is this some new smart feature? or a bug? I'd hate to have it enabling mobile data when abroad without me realising.