Sure the Star Radio Communicator iPhone app looks kinda like that other communicator—you know, retro-futuristic design, flip door, 3 button layout—but last time I checked, Captain K's communicator absolutely did not make calls on Earth's phone system.
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iPhoneSavior says the 99 cent app gives you a dialing interface to place calls from within the app, making you feel like you're about five seconds away from bitch-slapping a couple of Klingons. But I can't imagine Paramount is at all happy with this. [iTunes Store via iPhoneSavior]