Pakistan's telecommunications authority has blocked 26 million SIMs after their owners failed to register ownership linked to biometric data.The country had launched a biometrics registration drive earlier this year over concerns that militants were using smartphones to coordinate attacks.Minister of State for Parliamentary Affairs Sheikh Aftab Ahmed confirmed the figure on Friday.Replying to a supplementary question, Aftab said that Cellular Mobile Operators were required to collect “Activation Tax” at the rate of Rs 250 per new SIM from consumers.In February, the Pakistan Telecommunications Authority (PTA) noted that biometric verification of 72 million SIMs had been completed.Bangladesh has said it will launch a biometric registration process for its SIM cards in November.