I recently changed my Idea Postpaid to Prepaid. They just asked number, did not ask for Aadhar copy or any other document. I gave Aadhar number which they entered in their app, they authenticated my fingerprint with attached device to Smartphone. Authentication happened within their app, and my Prepaid sim got activated immediately.^ i dont think the virtual aadhar wud work the way they are thinking simply coz everyone asks for copy of aadhar. no one ever asks just for the number !