How do I remove a phone number from group chat on iMessage?
A new person has the phone number that was in our group chat. I want to remove the number from group chat
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See here:
Add and remove people in group text messages on your iPhone or iPad - Apple Support
Note that you can only remove someone from a group chat if there are at least four people in the chat and everyone is using iMessages (blue).
If those requirements aren't met, you'll need to start a new chat without that person.