This function allows users to organize their multimedia files,like music files or videos and play these files whenever they want,as well as viewing their favorite photographs.The iPhone is also known for the variety of applications that it is able to execute.In order for an application to work on the iPhone,it must first be approved by Apple itself.The only way to obtain such software is by visiting the official online Apple store(commonly called AppStore).
The variety and number of these applications is not something to be afraid of,as Apple currently has stored over 20.000 application on the AppStore from several domains,like gaming,social-networking,map tracking devices,and many others that include famous brand or names such as YouTube or Twitter.
There are currently four models of the iPhone available.Each model has some new features and improvements since the last version,but they all share a set of characteristics that make the iPhone what it is,and are iconic for the device itself,like the size of the screen,the positioning of the buttons,and others.For example,the iPhone 3G(the second model) is named so due to its original and innovative 3G call ability,but also shares the original iPhone's screen size and button positioning mentioned above.The other iPhone models are the iPhone 3GS and iPhone 4.
Since the original iPhone,every model came with annoying requirement that forces the user to register the device as a mobile phone in order to gain access to the multimedia and internet features.This practice is often seen at the subsidized GSM phones but opposing the GSMs,iPhones cannot be unlocked by introducing a code.This requirement lasted just a few weeks as a man named Jon Lech Johnson soon discovered a way to bypass it.He used a few software programs and edited some data in the Apple iTunes binary.Later he posted all the necessary data on his personal blog so everyone could unlock their iPhones.When the iPhone 3G came out,hackers were a bit discouraged because of the new in-store activation that Apple implemented.
The iPhone comes with a SIM Lock that restricts access to the device for one particular carrier.These two details made the iPhone 3G a pretty tough nut to crack,but in the end,hackers discovered a way to register the phones from different networks,after shipping them over the sea.The original network for the iPhones on U.S. territory is AT&T,but only a quarter of the total number of sold iPhones were actually registered to this company.