The "IPA" is the application package for iOS. You can find decrypted and modded versions on community repositories: Internet Archive : Large archives like the Grand Theft Auto iPAs (x64) Rockstar Games iOS Archive host various versions of the game. Third-Party Stores : Websites such as iOSGods App Store
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Sadly, there is no SA-MP for iOS. However, if you want Rockstar multiplayer on your phone: gta samp ios ipa free