India's Bharti Airtel Ltd has agreed to sell more than 3,500 of its mobile phone masts in six African countries to telecommunications tower company Eaton Towers in a bid to cut costs, the companies said on Monday. Bharti Airtel will lease back the towers from Eaton under a 10-year contract, the companies said in a statement. In July, Bharti Airtel agreed to sell about 3,100 masts in four African countries to Helios Towers Africa.

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