NEW DELHI: The road transport ministry has urged all driving licence (DL) holders and registered vehicle owners to add or update their mobile numbers for both DL and registered vehicles through the Aadhaar authentication process. This will be a pre-requisite for availing any transport and driving licence-related services, sources said.The ministry has said people can update or add the details by visiting Vahan and Sarathi portals. “This will help them ensure that the details are complete, accurate, and up to date. Online facility has been provided to update mobile numbers on the portal,” it mentioned. State transport departments have also been sending messages to DL holders and vehicle owners urging them to update the details.Both Centre and state transport departments have taken the step to rein in vehicle owners and drivers who change phone numbers and addresses to evade paying fines. Sources said the govt may also bring a new rule to make it mandatory to update their address (Aadhaar) too.