The iPhone 4 and upgraded GPS functionality
Having gone from an iPhone 3G directly to an iPhone 4, your author was amazed by the leap in GPS performance between the two Apple handsets. Suddenly, the phone all by itself offered a superior GPS experience. The difference in GPS functionality on the iPhone 4 [...]
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http://iphonetouch.blorge.com/2010/09/08/the-iphone-4-and-upgraded-gps-functionality/