So, the weekend is just beginning, and you're ready to get the party started, but – oops, someone forgot the speaker. No biggie. You can turn up the volume with this simple trick. All you need is a cup (any cup will do!) and your phone. The hollow space inside the cup acts as a way to magnify the sound on your phone. Just place the cup on a solid surface.
Next, put the phone on the cup with the speaker facing inwards. Or you can put the phone inside the cup if it fits. Play your music, and it should get louder as the sound bounces around in the cup.