How to unjailbreak an iphone?

I want to unjailbreak a friend of mines phone, but i'm not too familiar with iOS.

Will factory restoring from the settings app do that? Or do i need to connect to itunes?

I believe you must restore the phone using iTunes.

Fire up iTunes on your Mac or PC.
Connect your device via the USB cable.
Either cancel the automatic backup with the on-screen slider or let it complete.
Click on your device in the left column of iTunes on your PC or Mac screen.
Click on Restore, select Backup if you cancelled it in step 3, if you didn't cancel it, select Don't Back Up.
Your device will now be restored back to factory settings and the Jailbreak removed.
When complete, select the backup you just created and iTunes will re-install all your apps and settings, leaving your iPhone, iPad or iPod touch how it was before venturing to the dark side!

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