Steps for transferring data differ between iOS and Android devices.
Data transfers between different operating systems are not supported.
■ For iOS
Supports iCloud backup and Quick Start.
For details, see Apple's support page.
■ For Android
Supports Google Play Games.
You can continue your gameplay by playing with the same Google Account.
For details, see Google's support page.
For details on what data can be transferred, see the page below.