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. NETC FASTag portal: Visit the official NETC FASTag portal. Log in using your registered mobile number or vehicle number. You’ll receive an OTP to access your FASTag account and view the balance and transaction details. Note: This method does not involve UPI apps or virtual payment addresses. Learn how to check your FAStag balance through your vehicle number, iMobile, Internet Banking, SMS and Customer Care Number for seamless toll payments. Those who have registered their mobile number with NHAI Prepaid Wallet can know the balance by giving a missed call at +91-8884333331.