iphone 4s, keypad sound not working, volume buttom doesnt show up or down
Hello,
I have bought my iphone 4s, 32gb 2 days back and i found out that the keypad sound does not work. i have gone to the setting, sound and turned on the sound of lock and keypad. However, its not working. also, the colume buttom when i click it up or down it doesnt show the bar, actually its doesnt work it shows only the symbol of sound.
i tried to reset, restore... no results
anyone can help me with that??
Thanks
iPhone 4S, iOS 5