It is important to find out why your phone's sound is not adjusting, as this may indicate a problem with your phone. There are several possible reasons why the sound on your phone is not increasing or decreasing.
One possibility is that the volume controls are not working properly. It could be that the buttons are stuck or that the mechanism inside is not working properly.
Another possibility is that your phone's speakers are damaged. They may be clogged with dust and dirt, or otherwise physically damaged.
There may also be a problem with your phone's software. This can happen if your phone has been infected with malware or a virus, which can cause various problems on your device. In this case, you may need to reset your phone or reinstall its operating system.
Finally, your phone may not have the correct audio settings. You should double-check these settings to make sure everything is set correctly. If not, then you can adjust them if necessary until the sound works properly again.
By taking the time to find out why your phone isn't adjusting, you can take action to fix the problem and get back to enjoying all your favourite sounds. If you're still having problems, it's best to seek help from a professional technician.