I have the IPhone SE. In order to send and receive MMS (photos ,etc) cellular data has to be turned on. Whether this counts against data use depends on who you talk to. Those who are in need to know will send me a regular text letting me know they sent pics. I will then turn on data to receive them then turn the data off again. A pita but it works for me. My wife's LG X Charge works fine for MMS with data off, I guess it is an Iphone thing.