If I restore my iPhone 4, will my contacts be deleted?

I have to restore my iPhone and don't want to put my contacts back in.

Don't do that google up, for any contacts back up,
application manager from youtube

(contacts will be deleted )

Yes when you restore you iPhone all of your information will be wiped out of it (Contacts, Calendar Information, Apps, Games, Music, Etc) it'll be as if you just bought the phone from the store without activating it.

It is recommended to backup all your iPhone files with your iTunes to your computer.although you will lost all your data after your restoring. But some of third party software can extract your contacts, SMS, photos, call history to your new iPhone!

The software like: iPhone data recovery here:
http://www.dr-fone.com/iphone-data-recovery.html

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