Aadhaar linking has been been made mandatory for many services. While linking Aadhaar with PAN should be done by December 31, it would be mandatory to do the same for the mobile number too. While the government has said that it is mandatory to do so, the matter will come up in the Supreme Court in December. A lot would depend on how the Supreme Court decides on the matter. However if the SC says that Aadhaar would be mandatory for various services then here are four deadlines you should not miss.