Pakistan day
23rd March is a national holiday in Pakistan to commemorate the Lahore Resolution of 1940. Armed forces hold different events across the country in connection to this day. It was informed by the authorities that mobile signals were jammed to avoid any security related incident, and ensure foolproof security for the full-dress rehearsal of Pakistan armed forces.
Islamabad and Rawalpindi. Timing: 5am on 28 March, 2016 - Onwards
Source http://dunyanews.tv/en/Pakistan/328829-Cellular-service-in-twin-cities-suspended