Nimbuzz is a well known multi-protocol that provides framework for IM and Social Networking in many PCs and Cell phones, has now been enhanced for the iPhones to interoperate with the Multitasking support in iOS 4.
This update will let you listen to MP3, view videos or even check your emails and yet allow to run Nimbuzz at the background. Nimbuzz provide you support to attend calls even when the apps are running at the background and you can also select between apps when you want.
This Nimbuzz app has a facility called NimbuzzOut that will indicate you the calling rates/minute up on the screen even before you call and when you dial the number.
You can download this app from app store on to your iPhone and iTunes.
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