Forza Horizon 3 was never released for Android or iOS.
reached its "end of life" status on September 27, 2020, and was delisted from official stores, though existing owners can still redownload it on supported platforms. Legitimate Ways to Play on Android forza horizon 3 android apk obb download upd link
The only legitimate way to play Forza Horizon titles on mobile is via Xbox Cloud Gaming (part of Xbox Game Pass Ultimate), which streams the console version to your phone. However, since Forza Horizon 3 is delisted, it is generally not available on this service unless it was previously owned and remains in your library. Risks of Unofficial APKs Forza Horizon 3 was never released for Android or iOS