We're currently looking into an issue that's affecting some Android players. You can find more information on it here: http://answers.ea.com/t5/Iron-Force/Android-issues-Unable-to-log-in-amp-disappearing-Legions/m-p/478...
Link your game to your Game Center account to save your game progress. Bring your progress with you if you switch devices.
Try these steps first to clear up any problems you may have when connecting to an EA game.
Reset, update, or link your account information.