What'll I loose when I erase all content and settings from my iPhone 4?

Ok here's he deal I made a mistake texting this guy and our convo want disappear so I'm going to erase all content and settings and see if it'll disappear! What will I loose?!

Your phone will reset to the factory settings. (Which are what came with it when it was bought) you won't have anything except the original apps it was programmer with and no contacts, photos, messages, bought apps, etc. Will be on there anymore.

You will lose everthing you added to the phone