Board Thread:Support Requests - Getting Started/@comment-32924241-20170822181306/@comment-9605025-20170822210511

I believe it is even simpler than that. If your Clash of Clans progress is associated with a Google account, you just need to login to that Google account on the new device. You need to logoff on the old device only if you want to use a new account on the old device.

But yeah, this isn't really the place for these types of questions.