Hello: what is the difference between sms, mms and imessages? How can I set my IPHONE 4 to just send SMS, if those are simple text messages? Thanks you. Annie
SMS - text message
MMS - picture message
Imessage - iphone to iphone/ipod/ipad text - not a carrier feature, so it is not part of any text plan). Uses wi-fi or 3g.
Turn off MMS and imessage:
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