I have been using this phone for 2 years. The display was changed once, but there are no problems. I use it just fine and it gives no trouble. You are welcome to use and check the phone for as long as you want. The two sound buttons on the phone do not work; it might cost 150-250 Baka to fix them. My uncle gave me this phone so there is no box. Whatever security you want will be provided, no problem.