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ASKER
The iPhone is a smartphone made by Apple Inc. It and the iPad, along with several other mobile devices from Apple, run on the iOS operating system, which has its own topic, as does the iPad for device-specific questions. Native iOS applications are written in Objective-C or in Swift using the Cocoa Touch frameworks or HTML5 compiled with the help of a package manager such as Adobe PhoneGap; a common IDE is Xcode.
TRUSTED BY
1) Connect the phone to iTunes and cancel the Sync if it starts. Then I would tak a complete backup of the phone. Then and only then, would I try and Sync or
2) I would use a 3rd Party product such as Touchcopy to backup as much as I can.
Of course, if the emails and contacts are on an Exchange account, then you won't need to back them up as setting the account up on the new iPhone4 will just download them from the server anyway.