If you see any dust on the earpiece grill then make sure to clear that grill before and see if it increases the volume by any chance. If the earpiece grill is clean or you cleaned off every dust particle from there and still the volume is low then follow the guide below to use an app to boost the earpiece.
Steps to Boost Earpiece Volume on Android Smartphone
Now, try calling any of your contacts to check if the volume has increased on the earpiece. If yes then kudos, you fixed our phone but if not then you need to get your phone repaired by the respected service center.
Wrapping up
This is how you can increase the volume of your Android smartphone’s earpiece. However, if your phone is not fixed by this trick then it may be a hardware issue, makes sure to take it to the service center to get that repaired. Also, read: Trick To Increase Loudspeaker Volume On Your Android Phone
