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Transferring Signal on Android
Quoting: dkg's blog - Transferring Signal on Android —
Signal Private Messenger is designed with the expectation that the user has a "primary device", which is either an iPhone or an Android pocket supercomputer.
If you have an existing Signal account, and try to change your primary device by backing up and restoring from backup, it looks to me like Signal will cause your long-term identity keys to be changed. This in turn causes your peers to see a message like "Your safety number with Alice has changed."
These warning messages are the same messages that they would get if an adversary were to take over your account. So it's a good idea to minimize them when there isn't an account takeover — false alarms train people to ignore real alarms.
You can avoid "safety number changed" warnings by using signal's "account transfer" process during setup, at least if you're transferring between two Android devices.
However, my experience was that the transfer between two Android devices was very difficult to get to happen at all. I ran into many errors trying to do this, until I finally found a path that worked.