The iPhone 3G has been sold in India by both Bharti Airtel and Vodafone since August 22, 2008, but the iPhone 3GS has yet to go on sale. Most Indian service providers struggle to ensure decent call quality and while the rest of the world is preparing to adopt 4G, India is gearing up to welcome 3G. The announcement came a day after Bharti submitted its bid in a bandwidth auction for 3G mobile telephony services in India. The successful bidders will be allowed to offer 3G services on a commercial basis from September 1st. At present, no deal has been announced for the iPhone 3GS at Vodafone.