I am suddenly unable to send text messages to one contact. He can send me messages, but when I reply or send him a message, I get a message saying "Text message not sent." I can call him. I can even send him MMS messages (if I attach a picture to a message, it goes through).
I am able to send text messages to anyone else. He checked his blocked numbers, and mine is not among them. Any ideas on what is going on?
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