My Apple ID is shared. If I change it on the other device will it change mine?
My Apple ID is shared. My text messages go to both phones. If I change the Apple ID on the other device, will it change all of them?
iPhone 8 Plus
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Text messages sent by iMessage vs. SMS will go to any device using the Apple ID as a destination. If you change the Apple ID on the other device then it won't receive messages destined for your Apple ID.
Apple ID Frequently Asked Questions - https://appleid.apple.com/faq