Bharti Airtel Ltd., India’s largest mobile-phone carrier, plunged the most in six years after rival Reliance Jio Infocomm Ltd. said it will offer free lifetime voice calls and the world’s cheapest data tariffs. Reliance, controlled by billionaire Mukesh Ambani, will start its service on Monday. Idea Cellular Ltd., the third-biggest operator, slid as much as 11 percent.
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