Hi I have try search of ask before and don't seem to find exact info. Recently someone iPhone keep without Internet and I send photo and it convert to MMS and that cost me extra charge (I am from UK). I know send as SMS will convert to SMS if no data and want keep that on. I wonder if switch off MMS in setting: will I still send iMessage photo and video like normal to other iOS device and recieve them from iOS device? Or switch off MMS prevent any iMessage photo/video send and receive? I don't want send MMS and receive MMS cos charge but do want keep SMS on if iMessage not available.