imessage won't work for 1 number?
When texting another iphone user, imessage was on, but it would not send as an imessage so it asked to send as an SMS text message instead and it did. Now I cannot get it to go back to imessage but only for that user. All other iphone contacts are working as normal. I have turned off and on imessage and the SMS option, the entire phone, deleted older messages, even the contact, still not working! Can someone please help me?!
iPhone 4 (8GB), iOS 7.0.1