If you have it connected to Origin, logout on your phone and login on your tablet.
When you open it on your tablet you might end up in an Anonymous account. Login buttons: Welcomescreen, bottom left. Friendscreen (minitowns) tap Bart/Milhouse, bottom right in the pop-up "add origin friends" enter log in info.
Either exit the game to access the Welcomescreen or play through the first levels to access the Bart/Milhouse button to take you to the Friendscreen with the minitown.
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D'oh! - Em