My mobile speaker no working

@krishnapad96274 do you get sound when you connect some headphones. It is possible that this is a stuck headphone connector. Make sure it is clear of any debris etc. Insert and remove the headphones from the jack a few times in rapid succession.

IF that does not work you may have to either replace the speaker or the jack. Use something like this video to work on your speaker.

All of this is only relevant if you have checked your settings, to ensure that all of those are properly set to allow the speaker to function.

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 the same problem as you do. It's easy and fun to create these guides. https://ifixit.com/Guide/new The iFixit community will appreciate this.