How can I disable iMessage for a phone number if the iPhone it's attached to has been destroyed? My sister dropped her iPhone in the bath, so she is now using an older non-Apple phone. Whenever I send her a message, it gets sent as an iMessage (and even says "Delivered"), but her device never receives the message.
The only information I could find was this Apple knowledge base article which states the following:
If you plan on transferring your SIM card or phone number from an iPhone to a device that does not support iMessage, turn off iMessage in Settings > Messages first. If you do not, other iOS devices may continue to try to send a message using iMessage first, instead only using SMS or MMS.
However, since this iPhone was destroyed, we can't get into the settings to unregister her phone number.
Best Answer
The simplest solution is to contact Apple Support (as this article makes clear) since they actually have engineers that can modify which devices and phone numbers are associated with your (or another's Apple ID).