India's Ministry of Road Transport and Highways is urging vehicle owners and driving licence holders to update their mobile numbers on the Vahan and Sarathi portals. This initiative aims to ensure continued access to online services, prevent missed notifications for renewals and fines, and improve OTP verification. The process is online, free, and requires vehicle registration or driving licence details. Outdated mobile numbers have led to issues with OTPs and missed alerts, impacting various transport-related applications and services.