How To Lower The Volume Of A Phone Speaker Without Using The Controls

If the volume of the speaker of your mobile phone is too low, then it can be increased.
All you need to do is find a broad neck vessel. Place the phone with music on in such a vessel, with the speaker facing the ground.
This will make the sound echo in the vessel and with a broad neck of the vessel, the sound which will reach to us will be multiplied and hence the volume of the music played will be increased.
A paper cup, jug, coffee mug etc. can be used. Make sure they have broad necks.