How to update iPhone without itunes?

I wanted to update my phone but I didn't know I needed iTunes so started to update it and now it says I need to plug in my phone but iTunes isn't working right now. I don't know what to do. I can't do anything on my phone right now and I need too.

Simple!
Go to your settings app > go to general > go to software update

It'll check for the latest updates and just tap Download and Install

You can do this by the following these bellow points…
1. All normal iPhones (non jailbroken) should choose this method.
2. Check that your device is compatible.
3. Back up your iPhone.
4. Start the update process.

For more help, you should go to bellow link…
http://www.wikihow.com/Upgrade-iOS