https://parivahan.gov.in

Driving license holders and registered vehicle owners are advised to ensure their mobile numbers are updated in the Vahan and Sarathi portals. This helps keep records accurate and up to date. You can now update your mobile number online without visiting the RTO.

Vahan
https://vahan.parivahan.gov.in/mobileupdate/

Sarathi
https://sarathi.parivahan.gov.in/sarathiservice/mobNumUpdpub.do