NIGERIA has repeated its demand for telecom companies to bar calls from unregistered phone lines, part of the government's policy to boost security amid an Islamist insurgency and a spate of kidnappings. The country's telecoms regulator had in December 2020 ordered mobile phone providers to add identification numbers (NINs) - containing personal data identifying the user - to every SIM card registered in the country or block the SIMs. The government had extended the SIM registration deadline several times before the latest directive to bar calls from unregistered SIMs. Communication Minister Isa Ali Ibrahim Pantami said in a statement outgoing…