when ever I tab my nexus 4 near rear camera there is a weird sound like some screw is loose in it
and this doesn't happen when i tab rear lower half
is anyone also experiencing the same problem or my phone is defeted ?
This is normal. I've seen two different explanations for it involving the camera and the sim card tray. I'm not sure which it is, but it is normal and it is not just the Nexus 4 that does this. My N4 does the same and I have had no issues with it.
I think it has something to do with accelerometer or the gyro sensor. Both these parts are physical sensors hence they need to have some degree of play in respective axis to sense the movement or orientation of the phone w.r.t earth.