i have an iPhone 5c. I have been using iMessage but I was texting someone and my iMessages wouldn't send because I wasn't using wifi at the time and my 4G was turned off. I simply pressed "send as text message" every time I was sending an iMessage. It automatically started changing to text messaging every time. It would go back to iMessage sometimes but I would keep pressing "send as text message" and now my phone won't go back to iMessage with that certain person. I have turned my phone off and even restarted it. Please help me change it back!
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What can I do to change the contact I'm texting, back to iMessage?