Photo browsing,entertainment, web browsing, and music playing support both upright and left or right touch widescreen orientations.
Unlike the iPad, the iPhone does not rotate the screen when turned upside-down, with the Home button above the screen, unless the running program has been specifically designed to do that.
The 3.0 update added landscape support for still other applications, such as email, and introduced shaking the unit as a form of input.
The accelerometer can also be used to control third-party apps, notably games and much more.
Futher more the iPhone 4 also includes a gyroscopic sensor, enhancing its perception of how it is moved.
A software update in January 2008 allowed the first-generation iPhone to use cell tower and Wi-Fi network locations trilateration, despite lacking GPS hardware.
The iPhone 3G, 3GS and 4 employ A-GPS, and the iPhone 3GS and 4 also have a digital compass its an amazing .
iPhone 4S supports GLONASS global positioning system in addition to GPS.a
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