February 6 2018 will be the last date to link Aadhaar with mobile, the Centre has said. In an affidavit that runs into 113 pages, the Centre told the Supreme Court that, it was the court that approved the norm for mandatory linking of Aadhaar in the Lokniti Foundation case. The deadline for linkage of Aadhaar with mobile phone number cannot be modified by the government unilaterally as it is fixed by the SC, the Centre said. The Centre however stated that it has decided to extend the deadline for linking Aadhaar with existing bank accounts till March 31. Until March 31, existing bank accounts will not be made non-operational for not linking with Aadhaar. However to open new accounts, Aadhaar would be mandatory with immediate effect, the Centre also stated. For fixed accounts, the deadline for linking would March 31 and no coercive action would be taken until then, the Centre also stated in the affidavit.