The easiest and most predictable way of deploying images for mobile devices is to make your own custom images (both JPEG and GIF are supported) that take into account the reduced screen size of mobile devices. In general, it is good practice to design your images with clean lines and simple uncomplicated elements tend to appear ragged. It is better to use an image that is deliberately simple rather than try using a complex image that looks confusing. Keep in mind what is appropriate for the medium. If you want to look at high-resolution images, save them for the desktop and reserve your mobile Web pages for less graphical information.