You must link your mobile number: The following has been made mandatory in the states of Gujarat and Delhi (NCT): OTP authentication of mobile numbers will be done during registration of new vehicle Existing vehicle owners must update mobile number on the parivahan sewa portal by entering either engine number or chassis number as validation All online services through parivahan to be OTP authenticated from 01.09.2019 Security features in VAHAN & SARATHI allows of 5 vehicles against one mobile number Data entered enables tracking of individual and ensures security and integrity of system