You must keep your account connected before switching your mobile device in order to continue playing the game on the new device.
You may connect your account at 'Settings > Account Settings (Changeable field)' and connect your account with the following methods depending on the device that you are using.
- IOS: Connect your account through your account in Game Center or Facebook
- Android: Connect your account through your account in Google+ or Facebook
* When you are switching from IOS -> Android or Android -> IOS, you must connect your account using your Facebook account only.