[jonknee]

You don't lose SMS if you're on iOS, your new device has all the content of the old one. That's a nice part of the walled garden I suppose.

[untog]

All SMS or just iMessages?

[cdcarter]

All SMS. To the user there is no meaningful distinction between SMS and iMessage, except for the extra features. My mother, as an example, just thought that some contacts were green and some were blue as a nice way to make things interesting.