The iPhone 3GS has lots of available software and some of the most popular apps are those that let you turn the 3GS into a GPS navigation device. The issue for many is getting the iPhone in a position that will let you see it while you drive.
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The typical stand-alone GPS device comes with a window mount and NewerTech has announced a new window mount specifically for the iPhone 3G/3GS. The device has an articulating arm that lets you adjust the position of the iPhone on the windows.
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A large suction cup sticks the holder to the window and the iPhone holder can be swiveled to put the iPhone in portrait or landscape mode. The overall length of the holder is 9" and it only comes in black. The device is available now for $19.99.