After Vodafone iPhone Pre-registration campaign, Airtel also joined the party by starting their own online booking for iPhone.
If you are Airtel subscriber and don’t want to switch to Vodafone for iPhone then you may register for iPhone with Airtel. I have registered with both operators to make sure that I get iPhone as early as possible.
Airtel unlike Vodafone provides online registration facility only. To register head over to Airtel-iPhone registration page.
Related: Register iPhone with Vodafone