Does USP do mobile aps and sites?
Look at this site on a smartphone display, and you will see that the address picks up the ?mobile=1 instruction, and the content delivery is optimised accordingly. You can twist and stretch to taste.
There are a number of design and technical considerations when creating sites and aps specifically for mobile/tablet displays, just tell up what you need to achieve.
Despite the apparent ubiquity of the Apple iPhone and iPad in the hands of the media and designers, the more cost effective Android platform is the most popular smartphone in the general marketplace.
And turned on its side...