Since your account is automatically linked to your Google Play account or Apple’s Game Center account, once you switch between these platform, you will not be able to auto-cover your old progress.  Before migrating to a new device, we recommend you create a migration code.  Go to the “Setting” menu and click on “Link Device” to create a migration code.  You can use this code to recover your game progress on your new Device from the “Setting” menu again later.