I wanted to clear everything off the phone the including myspace apps. camrea Says low memory But has no pic ?

I wanted to clear everything off the phone the including myspace app and all ring tones. Camrea says low memory but has no pic on the phone. How do I return the phone back to factory settings.I wanted to clear everything off the phone the including myspace apps. camrea Says low memory But has no pic ?
manually delete it all, or call your provider and they can tell you how to reset it