Thanks for visiting Apple Support Communities.
It sounds like you would like to restore your iPhone.
Restoring your device will delete all data and content, including songs, videos, contacts, photos, and calendar information, and will restore all settings to their factory condition.
See this article for the steps to restore your phone:
iTunes: Restoring iOS software
If you want your phone to be "like new," then you don't need to restore from a backup (as mentioned in step 5.)