New Delhi, Jun 02: Sunil Mittal-owned Bharti group today announced an investment of over Rs 175 crore on its network of mobile infrastructure in Delhi circle, taking total investment to Rs 1,950 crore by the end of this fiscal. Celebrating the 1 million customer mark in one mobile circle (Delhi), Bharti Group said it would be commissioning the sixth mobile switching centre in Delhi in the next two months. Bharti's Airtel has more than 415 cell sides in Delhi and plans to install another 35 sides in the next three months. The company is planning to double the short message service (SMS) exchanging capacity in the circle. Bureau Report