How to unjailbreak a iphone 4?

I jailbroke an my iphone 4 with evasi0n.com and now i want it unjailbroken. How can i do this without connecting to Wi-Fi or to a computer

You can't

Restore it with itunes.

You can do so by simple updating the software of your iPhone. Go to settings, software update and download the latest version. It will automatically remove the jailbrake. But in order not to loose any data, it is recommended to back up using iCloud or iTunes.

I've a question: Why is it that you wish to unjailbreak your phone? Was there a problem that you needed addressed?

Link to video guide below!

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