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You can ask your contact to use the unregister app here https://whispersystems.org/textsecure/unregister/ https://whispersystems.org/textsecure/unregister/ App
by horusx 11y ago
You can ask your contact to use the unregister app here https://whispersystems.org/textsecure/unregister/ https://whispersystems.org/textsecure/unregister/
Apple offer a similar tool when leaving iOS https://selfsolve.apple.com/deregister-imessage https://selfsolve.apple.com/deregister-imessage