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iPhone 4 doesn't have turn by turn, only iPhone 4S and iPhone 5 has that feature

iPhone 4 is missing the 3D flyover, but it most definitely has turn-by-turn.

No. Source: http://www.apple.com/ios/maps/ (also, the iPhone 4 sitting two feet from me).

Maps has had driving directions since 1.0, but only the latest and greatest maps app on the 4S and 5 (and the latest two iPads) do turn by turn.