(Telecompaper) The Tanzania Communications Regulatory Authority (TCRA) says some 20.4 million mobile telephony subscribers failed to register their subscriber identification modules (SIM) cards biometrically by the 20 January deadline, The Citizen reported. According to the latest figures from the TCRA, some 48.8 million SIMs are in use in the country. Only about 28.4 million cards have been registered under the biometric system.