iMessage sent as text message
I sent a friend an iMessage but it was sent as a text instread. What I don't understand is I sent that same message thru the Messages app on my Mac and the friend recieved it on his iPhone as an iMessage. So I seem to be able to communicate with him thru the Mac messages but when I use my phone it goes as a text.
Other friends with iPhones I can iMessage just fine.
I know iMessage requires wifi but I assume my wifi is ok if I can Imessage other people and my friend's must be ok as ge gets the iMessages I send from the computer. I just can't figure out why when I use my phone it goes as a text.
iPhone 4S, iOS 7.0.4