UPDATE 2-Vodafone, Bharti spend big to win airwaves in $10 bln Indian auction
* Bharti, Vodafone win 900 MHz band in key cities * Reliance Industries unit buys airwaves in 1800 MHz band * Govt to get $10 bln from auction, at least $3 bln upfront By Devidutta Tripathy and Aradhana Aravindan NEW DELHI, Feb 13 (Reuters) - Indian mobile market leaders B
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