South Korea's telecoms watchdog has ordered mobile carriers to delete some 900 million fingerprints collected from customers over the years for ID verification purposes.Following an order from the Korea Communications Commission, KT Corp, SK Telecom and LG Uplus Inc must delete all fingerprint data within the next 12 months.”Mobile carriers admitted that the volume of fingerprints they've collected is in excess,” a KCC official told the Korea Herald. “They plan to destroy 80-90 percent of them by the end of this year.”Korean citizens aged 17 and over have ID card with his or her thumbprint stamped on the back. Mobile carriers make copies of the front and back of users' ID cards for new subscriptions.Last January, credit card details from almost half of all South Koreans were stolen and sold to marketing firms. The data was stolen by a computer contractor working for a company called the Korea Credit Bureau that produces credit scores.In January this year, the Pakistan Telecommunication Authority completed the first phase of a biometric re-verification process designed to link the country's entire population's fingerprints to their mobile phones to combat militancy.