Official user interface (UI) and user experience (UX) guidelines from the manufacturers, links to which you can find below, are a source of inspiration for mobile web and app design. Here, you will find guidelines, samples, tips, and descriptions of common mistakes. Many of the guidelines focus on native application development, but we can apply most parts of them to mobile web design too. Remember to provide the best possible experience on each platform. Do not deliver an iPhone experience to a BlackBerry user. Every platform has its own UI and usability guidelines that every user is expecting on your app
My grandfather told me this story once: He was buying some cloth and when looking at one of the cloth designs… and he thought to himself “that is so ugly!” He barely finished the thought when another customer came running in with her fiancé and mother-in-law and went directly to that same design he was thinking about shouting, “Here it is, the design we were looking for!” and bought the whole lot!