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The mobile development landscape has completely changed with major disruptions, mostly from Apple and Google in the form of the iPhone and Android, respectively. Carriers have lost power, and this power has shifted to the phone manufacturers and developers.
Currently the best platforms for location-based services are the iPhone and the Android. These two platforms support easy retrieval of the device location, unlike other platforms that require you to maintain a cell tower database. RIM also announced some new platform APIs supporting GPS, but they aren’t widely deployed yet.