The iPhone and now the iPad are the most perspective next-generation mobile platform in the today’s market. The process of designing an iPhone/iPad application is very much like to that of the creating a Mac OS X application. iPhone is a mobile platform, and it has other purposes when comparing with a Mac OX. When designing an iPhone/iPad application you need a different approach. Such features like touch screen, limited memory size and completely different field of use, should be carefully taken into consideration. Also, the fast updates in technologies behind these two magnificent gizmos have to be kept pace with while still not shedding the service of older versions until they turn obsolete. That?s what we do, as for the iPhone 4 we design apps not only with its latest software, i.e. iOS 4.0, but also with its older variants that still have a wide user base, i.e. iPhone OS 2.0 for iPhone 3G and iPhone OS 3.0 for iPhone 3GS.