There are no other problems in the phone except two spots.
Those spots happened a year and a half ago when it fell from hand. Apart from that, there is no other problem. I bought it new and used it continuously for five years, but I haven't faced any kind of problem till today.
It has never been serviced either. The phone box is no longer at hand after a long time. However, I can provide any kind of security. You can check it as much as you want.