Re: Simcity data transfer
If you want to transfer your city from one device to another but your Facebook account already has a city you don’t want saved to it you can still back up your current city to a new Facebook account and then login on the new device with your new Facebook account.
Also, if the new device is the same OS as your old device (Both Apple or both android) you could back up your city through Game Center/Sign in with Apple or Google Play and then sign in with that instead.