15 tips for using iPhone 4 and IOS 4

IOS 4 added some notable new features such as multitasking, turn off the screen, or upgrade the message, take pictures.

Apple's new operating system being used on the iPhone 4 is much improved compared to its previous version of this smartphone. Currently, the IOS was able to set up 4 iPhones 4, 3GS and third-generation iPod Touch, the old machine as second-generation iPod Touch and iPhone 3G features are limited. iPad is a newly refurbished last year.

Here are some tips on using IOS 4 and iPhone 4.

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