For every transaction at a toll plaza, you will receive an SMS alert on your registered mobile number about the balance deducted from your FASTag wallet. There are 3 ways to check your FASTag wallet balance: Give a miss call to 7406575500 from your registered mobile number Login to the Kotak FASTag Customer Portal https://fastag.kotak.com with your User Id to check balance Call our Customer Care Number 1800 3006 9090 to know the balance Note - The wallet balance can be used by all the vehicles linked to the wallet.