I forgot my iPhone passcode, how can I do a factory reset or restore it?

I don't have the computer I synced the iPhone to anymore, so I can't go into iTunes. Is there like a program to bypass this? Or a combination of buttons? I've tried many things to restore it, but It all involves me going into iTunes. Please help?

Added (1). To the people that have responded saying "It doesn't need to be the comp you synced it to" it does, it won't let me connect because it gives me an error saying "This iPhone is locked, you need to enter the passcode, and try again" And I kinda don't remember my passcode

It doesn't have to
Be the computer your iPhone is synced with. Plug it into a computer run iTunes click the name of you iPhone and the when it brings up the iPhone info click restore. If this does not work try going to an electronic repair store

To the apple store!
or one of those hackers that do that for you…