It would be nice if there was a notification saying the person transferred to a new phone but kept the safety number. This way you can choose your level of para

It would be nice if there was a notification saying the person transferred to a new phone but kept the safety number. This way you can choose your level of paranoia. And there could be a setting to suppress this message (on the receiver). But in general, if the migration is done securely then migrating the key material seems fine too. By cutting down on benign cases where something changes, this makes the safety number change warning something that warrants more attention.