With iPhone, it is possible to use multiple applications from one to another instantly without hindering the performance of the application used in the foreground or unnecessarily deplete the battery. It is the role of the user interface of iPhone multitasking.
In fact, multitasking user interface allows to quickly switch between applications running simultaneously. To do this, simply double-click the Home button to display recently used applications. You can scroll through and reopen each of these applications without having to wait for another load.
If you are on a task that takes time, like downloading pictures, you can switch to another application without having to interrupt what you ran in parallel.
With a kind of memory, apps remember where you left off (which is why we call these kinds of phones "smart phone"), which lets you resume directly to what you had initiated (read, play, research ...).
iPhone 4 you can even receive Skype calls or VoIP while other apps running, or talking time of a call while moving to another task (reading mail for example).
Other apps like GPS can keep running in the background, like you can receive alerts and messages without opening the app that sends the notification.
With iPhone, smart phone, no need to wait and do nothing, you're multitasking!
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