UNB, Dhaka :The Post and Telecommunications Department asked all subscriber identification module (SIM) card-holders to go through the re-registration process of SIM cards within the stipulated time.The Post and Telecommunications Department has come up with the request through a handout of PID on Tuesday.It also asked the SIM card holders to verify their SIM cards through Short Message Service (SMS) and mobile operator website. For verifying SIM cards-the Grameen Phone, Bangla Link, Robi, Airtel and Teletalk users have to go to the SMS option and then type their National Identity Card (NID) numbers in English, date of birth and full name-after completing all the process the users have to send the message to 1600.For Citycell users-they have to type U then (space) and write their NID numbers, date of birth and full name-and send to 1600.The mobile phone operators will send a return message to the subscribers. However, the mobile phones operators have already send SMS seeking information including the NID numbers and parents name to the subscribers.Those who failed to complete their re-registered SIM then it will be closed automatically. All mobile phone operators of the country will start re-registration of subscriber identification module (SIM) cards following biometric method on pilot basis on November 1 and it will fully starts from December 16.