Is your website compatible for mobile devices?
Regular websites are made with the perspective of regular computer screens which are usually biger then 13 inches, and have min. resolution 800 x 600. Whereas smart phones and tablet PCs screens are much smaller and also mobile browsers don't support all plugins and technologies like Flash and scripts.
Try opening your existing website on your Blackberry, iPhone, Android, Nokia or any other mobile phone that you use. You will see that the experience of browsing your site is not the same, when viewed on a Desktop or a Laptop.
As smart phone and mobile technologies are evolving, more and more people like to use internet on phone as compared to sitting on a desktop.
Do you know there will be 240 million mobile browsers as compared to 200 million PC browsers by 2013.
At Wisdom, we develop, specialized websites, that automatically detect mobile browser, and show website to handheld users which is build according to their screen size and resources.