The Speaker not working

@vikashvishnoi you are not giving us a lot of information. All you could do is give us 3 words to try and help you? It would be nice to know what you have tried to fix this. Or at least to let us know what you have checked.

First off you want to reboot your phone to eliminate any temporary glitches. Press and hold the volume down button and the power button simultaneously for about 10-15 seconds

After that you need to make sure that you have the latest update for your firmware. Check on that by going to Settings > About Device > Software Updates > Check for Updates.

Next clear the cache by going to To clear storage cache, proceed to ******Settings > Storage > Cache Storage

If none of that works, it's time to replace the speaker. Since iFixit does not yet have a guide for that, use something like this video Replacement speakers are readily available at many online stores

I realize that you are not a person of many words but you should still consider helping out. While you work on your phone, take lots of pictures. Once you are done with it, take those pictures and create a guide for iFixit. That will help the next person that has a device with the same issues as you do. It's easy and fun to create these guides. https://ifixit.com/Guide/new The iFixit community will appreciate this.

Repair is War on Entropy!