mms
I always use email or post imge online rather than using MMS on 3 to avoid any costs outside my montly deal. I only keep it as I'm on an ol (no longer available) deal with unlimited data very cheap.
I wonder if 3 are liable on a "3 branded" phone if the phone converts emojis to mms images? After all ikt is obviously in 3's interests if that behaviour occurs and arguably a responsible network would ensure their branded phones did NOT do that...