How to fix the "waiting for activation?"

My IPhone's iMessage suddenly says "Not Delivered," and after varieties of ways to restart the iMessage, it just is stuck in " waiting for activation."

my Ipad doesn't occur this issue, but couldn't send pictures but messages.

I can send both pictures and messages to other friends, expect one friend.

iPhone 5s, iOS 10

Posted on Dec 23, 2019 3:23 AM

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How to fix the "waiting for activation?"

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