Signal also has other issues on iOS, like the lack of message backup/restore which exists on the Android version. Every time I upgrade my phone I have to refor

Signal also has other issues on iOS, like the lack of message backup/restore which exists on the Android version. Every time I upgrade my phone I have to reformat & disable iCloud lock and hand in my device before I get a new one. So Signal's workaround of having two phones side-by-side to transfer is a non-starter. (Also useless if you happen to physically lose your old phone.)