Bharti Airtel’s Mauritius-based arm, Network i2i, has sold its 2.3% stake in Helios Towers for £36.9 million (Rs 347.5 crore approx), and the deal proceeds are likely to be used to cut the telco’s debt further.Network i2i has sold 23.1 million shares in Helios Towers at £1.6 per unit, amounting to a 2.3% stake in the UK tower company.