Airtel, fell silent in Hyderabad since 6 a.m. on Saturday morning with what was termed a systemic failure of its network.

Enquiries revealed that Airtel was doing some system integration and upgrades on the network that includes slightly over 2,500 cell sites in and around Hyderabad. However, somewhere in the communication loop, a snag led to what was well nigh a complete breakdown of its mobile services including voice and data.