iCloud storage
If I delete my iMessages from iCloud will it delete them from my phone too?
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If you have Messages in the Cloud set up (see Set up iCloud for Messages on all your devices ) then yes, your deletions will synchronise to all devices.
Keep your messages up to date with iCloud
Because your messages are in the cloud, if you send, receive or delete a message on one device, those updates appear everywhere. You see the most up-to-date version of your messages, no matter where you access them.