All you need to do is to log into the same social network account (Facebook / Game Center) you previously used in the game. Please note that due to legal requirements, access to SNS and social features in the game is removed for some players.

You also have the option to back up your progress this way (for iOS devices only):

1. Connect your older iOS device to a computer with the latest version of iTunes installed.
2. Select your iOS device in iTunes under Devices.
3. Right-click the device and select ""Back Up.""

To restore game progress from a backup:

1. Connect your new iOS device to the same computer.
2. Select your iOS device in iTunes under Devices.
3. Right-click the device and select ""Restore from Backup.""

Although you do have such an option, we recommend that you play on one device at a time to avoid progress conflicts.