I today had basic question in my mind ,what is the difference between testing functionality in browser and same in mobile. say testing m.gmail.com in browser and same directly in mobile using selenium.Is there any difference other than the fitting into screen etc.
If you have a different server to handle mobile requests, you might have different implementation of the features, thus, you need to test both platforms.
The content might also be delivered according to the mobile browser used (Safari on the iPhone is much more feature-rich than the default N95 browser, for example).