The reason: Apple's new smartphone does not support the TDD or 'time division duplex' version of LTE technology that powers 4G networks in India, but runs on its older and more globally trusted variant, FDD or 'frequency duplex division', deployed by most 4G operators in the US and Europe. As a result, the iPhone 5 supports LTE or 'long term evolution' technology only on the 1.8 GHz band and not on the 2300 MHz band frequencies auctioned in India two years ago.
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