Within 2 days, the top part of the screen stopped responding back.
Initially it used to work after locking the screen and then unlocking it but now it doesnt even responds on rebooting the phone.
What should I do now?
It is a common problem found in many SP phones. I went to purchase a black SP and it had the same problem. I checked there itself and changed it with white SP. It is not the problem of navigation bar. Navigation bar will work when you rotate the screen. The problem is with the touch screen. You can check this by enabling 'show touches'. My suggestion is to change the phone.
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