You are able to play Marvel Strike Force across your different devices. Here's how:

1. Go to the device where you play the game primarily
2. Go to settings (gear icon at the top right corner of the game)
3. Tap "Connect With Facebook"
4. Facebook window will appear and you will need to login using your Facebook account
5. Once you have logged into Facebook on the primary device you are playing the game, you can now use Facebook to sign into other devices.

Please note: In order for you to play across iOS and Android devices, you will need to be on the most recent game version. It is recommended you continue to save your game on either Game Center or Google Play.