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You can easily reset an iPhone to it's factory default settings using only the iPhone itself. It only takes a few seconds to initiate, but how long it takes to complete varies depending on the iPhone model and how much stuff you have on there.

http://osxdaily.com/2012/01/17/reset-iphone-factory-settings/

If you are doing this for troubleshooting purposes, remember to back up your iPhone first!

Here is how to backup with iCloud:

http://osxdaily.com/2011/11/06/manual-icloud-backup-ios/

And how to backup iPhones with iTunes:

http://osxdaily.com/2010/06/22/how-to-backup-your-iphone/

If you do not back up beforehand you will lose all data, settings, and personal stuff on your iPhone.