Mobile phones have surpassed PCs with over 2.4 billion sold globally last year. 350 billion text messages are exchanged monthly worldwide. Mobile reaches audiences that other media cannot. 10 million Indians use GPRS, enabling applications. Mobile is already a platform, but integrating web services is the future of mobile. Marketers must unlearn 'just-in-case' approaches and learn 'just-in-time' contextual and personalized messaging to move from communication to conversation. Mobile offers interactivity like initiating calls or downloading content.