I'm having the weirdest issue with my 7+. All of a sudden yesterday all messages to one (and only one) contact will not send as iMessage. This also affects group chats with this person in it. His iMessage works for other friends and contacts, but will only send as a text to me. He's a close friend so he has not blocked me. Weirdly enough, if I try on a few family members' phones that don't have his number saved, his number will not show up as an iMessage device. That would seem like his iMessage was disabled, but other friends can still iMessage him easily. I'm relatively new to recent iOS devices, does anybody know how to fix this? It throws a wrench into the ease of texting and group texts that iMessage offers.