Looking to continue on the success of their iPhone 3G, Softbank has announced that they will be launching a terrestrial TV tuner / battery-pack add-on for the Japanese iPhone 3G market.

The iPhone 3G has been criticized for its lack of the TV-tuner capabilities that much of the Japanese market demands in their handsets. Still, without a TV-tuner, the iPhone 3G has managed to boost Softbank’s profits and net subscriber additions. And, the Japanese carrier is apparently keen on squeezing more profits from the iPhone 3G.

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