What happens if i click delete all content and settings on my iphone?

If I click "delete all content and settings" on my iphone, is it going to delete all my contact, message and notes?

p/s: sorry about my english. ( still learn to speak better english)

Well yes, it deletes all content and settings on your phone as stated.

It will delete everything and I mean everything. It will be like your iPhone when you first bought it. Nothing except the original apps such as: App Store, Photos, Contacts ( but no contacts inside), Phone and so on.

P.S. Your English is fine.