Why can't I text or call one person?

Me and my friend both have an iPhone 6, and he can text me, but I can't text him. When I text him it doesn't deliver, so I click 'send as text message' and he doesn't receive that either. I can text other people fine, but not him and I can't figure out why. I also can't pick up Facetimes from him which is also an issue.

There seems to be an issue; you need to speak to an Apple worker.

Maybe hes got you blocked for some reason

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