Deleting messages on all devices
If I delete a message on my iPhone, how do I get it to delete on my other devices?
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You can achieve that by using iCloud for Messages on all your devices when they are signed to the same Apple ID. To use iCloud for Messages, open Settings ➡️ Apple ID (Your Name at Top) ➡️ iCloud ➡️ Messages: Set this to ON.
Axel F.