What if i don't have itunes, how else can i reset my iphone 4?

What if i don't have itunes, how else can i reset my iphone 4? - 1

Settings? But I think you need iTunes.

Settings>General>Reset>Erase All Content and Settings
This will work only if you can get into the phone.

If it's is completely frozen and has a damaged system, you can only use iTunes.

On the phone itself, using the Erase All Content & Settings option in the Settings