Payloom3 and optimum image dpi/size for iPhone & other phones?

I could be wrong but I think I need to create separate PL3 pages for the iPhone/other phones. My thinking is I need to reduce the size of the images so as to not slow loading times on these devices? If so what is the optimum image size needed? I believe PC screens are about 72dpi (any larger is a waste of space), so what’s the smallest I can use for iPhones and what would be the longest length (in pixels please) of each image used? I’ve also noted that there’s an array of iPhone/phone sizes, so I guess there has to be a happy medium.

Thanks,

Andrew

Any ideas/facts?

Thanks,

Andrew