You don't have to update your account Detail with Airtel as often as you may think - usually every 6 months is enough. Secondly, if you registered for a mobile number with Airtel, you can use that same mobile number to sync your account with the website. Simply enter your mobile number in the My Number section on Airtel website and click on the Activate link next to it to finish setting up syncing process. Finally, if you have any questions or issues with your account, don't hesitate to reach out to Airtel customer care using the contact details provided on their website.