Advisor to the Prime Minister on Interior has said that all unregistered Sims of various cellular companies being used would be blocked after March 31, 2009. Official statement further said that Nadra would verify the data of buyers of the SIMs.
About the already unregistered Sims being used, he said messages would be sent to mobile phone numbers users to register Sims (Subscribers Identification Module) in their name, otherwise these would be blocked.