Today the high technologies give citizens an unrivalled possibility to facilitate and carry off their life with the aid of state-of-the-art developments and arrangements. One of such facilities is pocket digital assistant, as well called iphone games. PDA is a genuine computer so it does not possess the functions of the telephone. Playing video files, audio files, being used as a notebook, working with word processors and other sorts of handy utilities are the features of it. That is, the PDA will be very handy for citizens who do not keep still for long and who do not want to lose the time in the course of journeys. During lengthy journeys, you may watch a film, look through a book or play games for windows mobile by means of appropriate programs. Agree that to keep about you a fat book is a little problematic. Such device turns into very much precious if you bear in memory that the PDA may hold a number of books or games. You must also know that such device is multitask which implies that you can combine enjoying the audio with looking through a book. Many persons are also concerned in Free mobile themes, so they may easily obtain it on the web.The OS (operating system) is the integral component of each PDA. There are several variants of operating systems for PDAs including PalmOS, Microsoft Windows Mobile and Linux. The plus of Linux is that it has free utilities, while regular clients are more habitual with Windows. PalmOS is simple to use, because it has been especially developed for the PDA, though during the usage of a number of tools simultaneously failures appear. As soon as you’ve clarified which OS meets your needs, you have to take into account more substantial parameters, such as the input medium, computer horsepower, capacity of read-only memory and main memory, screen size and the possibility of expanding the memory.Each PDA has a complication of energy consumption. At this stage, makers can’t achieve perfect performance in this sphere.