Related read: How to recharge FASTag with vehicle number? FASTag balance check – Airtel Thanks app Follow the below steps to check your balance: Download the Airtel Thanks app. Once logged in, head to the pay section within the app. Tap on FASTag recharge. Now choose your FASTag issuer from the drop-down. Enter your vehicle registration number. Learn how to easily check your Fastag balance using your vehicle number. Discover the process to ensure hassle-free transactions and avoid any inconveniences. Learn how to check your FAStag balance through your vehicle number, iMobile, Internet Banking, SMS and Customer Care Number for seamless toll payments. Provide the vehicle number associated with your FASTag account on the balance check or transaction history page. After entering the vehicle number, click on the button labeled 'Check balance' or 'View transaction history'.