There are many people who have Aadhaar card but they have a question in mind \u2013 How to register mobile number online in Aadhaar card or how to change mobile number online in Aadhaar card online. So, here is the answer to this question. According to the answer given on UIDAI website in response to one of the Frequently Asked Questions, for any online update request in terms of Aadhaar number, including updation of mobile number, the resident should already have an active number registered with UIDAI. This number is important because by this number a person can receive OTP SMS and authenticate himself If your number is not registered, you would need to visit nearest UIDAI permanent enrolment centre. Earlier, the Supreme Court on Wednesday had said that the alleged defect that citizens\u2019 biometric details under the Aadhaar scheme were being collected without any law, could be cured by subsequently bringing a statute. \u201cWhat the position will be with regard to breach that could\u2019ve taken place between 2009 and 2016 when the enabling law came into force,\u201d a five-judge constitution bench headed by Chief Justice Dipak Misra asked. In another news, it was reported on Wednesday that Assam government has intimated the Supreme Court of its inability to stick to the March 31 deadline for linking Aadhaar with various core services. Hence, Assam to miss March 31 Aadhaar linking deadline. Assam govt has conveyed the message to the apex court via the Unique Identification Authority of India (UIDAI). The Income Tax Department has already excluded Assam from linking Aadhaar by March 31.