[plusquamperfekt]

Maybe for a synching feature it would be necessary to compromise on security of the data. The data is asymmetrically encrypted - so you'd have to synch it yourself by sending the data encrypted with you second phones key or you'd have to copy the private key itself. But I guess it would be possible. Though I don't miss this feature anyway.

[superuser2]

iMessage already does this without leaking private keys by associating users with many public keys (per-device) instead of just one.

[rodgerd]

Yeah, telling everyone I want to communicate with they have to buy an iPhone to talk to me any more is a totally reasonable approach.

[superuser2]

I'm just pointing out what the solution is for end to end encrypted messaging when users have multiple devices. No need to be hostile.

[plusquamperfekt]

I don't trust Apple ...