Screen goes off during call and does not come back in Micromax A89 I am using Micromax A89 with

ICS 4.0.4
512 MB RAM
Screen 4.0 Inch


I am facing this problem since beginning. But it was solved automatically. Now again it happens when I dial a call or receive a call my mobile's screen goes off and does not come back. I must have to use power button to end the call (I set "Power button end call" checkbox from settings).

I think it's a proximity sensor problem but not sure?

But when I restart my mobile then it works for 1 or 2 calls but after it again it creates this issue.

Any help would heartily be appreciated.
I faced the same problem but I found a simple and perfectly working solution:


Dial *#*#7769#*#* (Proximity sensor calibrator) 
You will see 2 options Start and Exit
Click on Start. 
Move your finger over the proximity sensor 3-4 times and try to change the value on screen.
If values are changing after 3-4 tries then your problem is solved.


Thanks to nighil g