Q: I am not able to hear any sound while playing videos

Hello komalrawal,

Thanks for using the Apple Support Communities!

I understand that you are having an issue hearing sound from video on your iPhone. We know that issues like this can be very frustrating, but we are here to help! To begin troubleshooting this situation, I would suggest reading over and working through the suggested steps located in the following article. 

If you hear no sound or distorted sound from your iPhone, iPad, or iPod touch speaker - Apple Support

Cheers!