UPDATE 2-India's richest man unveils telecoms venture with free calls, cut-price data
* Tycoon Ambani plans 4G data at 50 rupees per gigabyte * No date yet for commercial launch * Test customers to get services free until Dec 31 * Shares in rivals Bharti Airtel, Idea Cellular slump (Adds further details) By Promit Mukherjee MUMBAI, Sept 1 (Reuters)
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