hey all, this is my first posting here, i'm sorry, i have a bad english.

okay, straight to the point, i need assistance with my cell phone (Nokia 6585 CDMA)
since yesterday, suddenly my cell phone lost its 'create message', 'sent items', and 'message setting' MENU.
i don't have any idea with it. i haven't done anything yet. i just ask my friend, and he says i have to reset my N6585.
can anyone give me a solution?? maybe codes or anything else?? or should i just go to the CS and let them repair it??