According to Net Applications the iPhone has over 66% of the mobile web browsing traffic. It’s understandable that the iPhone has the market share as it does give a great user experience and the zooming capability is excellent. From a development point of view the iPhone’s Safari browser displays the same as the desktop browser which helps reduce the need to test for yet another browser. However as the market leader and one of the first real serious mobile browser, i’m sure there will be stiff competition from Googles Android (see video below) that has over 6% of the market share.
Opera’s mobile browser Mini and Opera Mobile (which I prefer) and is another great browser that surprisingly doesn’t even feature on Net Applications results. I would highly recommend it enhances or should I say saves any windows mobile phone when you’re looking to browse the web.