A:AnswerI think so. But 1. It isn't pretty. and 2. It's annoying.
It isn't flawless. I found issues with group notifications, or people responding and I would get a text from their number directly instead of in the group chat.
Hope this helps.
A:AnswerYes for calls and texts - will not work for sending/receiving photos/videos. It also won't any of the internet functions without an alternative connection (i.e. wifi).