Why can't my iPhone text one specific person?

This started happening about a week ago randomly, my friend who has a Note 3 stopped receiving my messages. I get all his messages, but he doesn't get any of mine. I've tried turning off my iMessage but that didn't work. It's really frustrating because he is the only person that I can't text. I have been texting other people (iPhone and non iPhone) and it's all working the same except when I try to text him. He s tried to reset his phone aswell but that didn't work, and neither of us know how to fix it.

Delete him as a contact, and then restart your phone, add him back as a contact and make sure you set him as SMS for texting.

You need to reboot your device and you need to delete your contact and try again and do install Leo Privacy Guard. It is the best app that any android or iOS user should have if he/she wants to secure his/her personal data.

Same problem. Figured could have been a carrier problem as we both have same carrier but I highly doubt it as everyone else gets theirs. Always worked before until recently and very puzzling. Nothing works. Could the new iOS update have refined things?

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