Event: Chehlum
Cellular service has been suspended in different cities including Karachi, Islambad and Peshawar as part of security arrangements on Chehlum of Hazrat Imam Hussain (R.A.) 21 November 2016 (Monday).
Cities Name:
Karachi, Sukkur, Hyderabad, Kotli, Multan, Lahore, DI Khan, Rawalpindi,
Rawalakot, Sargodha, Jafferabad, Jhal Magsi, Bagh, Muzaffarabad, Peshawar, Bannu, Gilgit , Bahawalpur, Quetta, Multan, Karachi, Islamabad, Peshawar, and Faisalabad
Source:
https://www.samaa.tv/pakistan/2016/11/cellular-service-suspended-as-part-of-chehlum-security/
2016 Timeline