cheap amplifier

need a cheap, non-electrical way to boost the sound of your smartphone?

i just love this not-so-recent tip from lifehacker... put it inside a glass and place it on a hard surface. how's that for a simple amplifier?



i tried this while taking a shower today, and my iphone was loud enough that i could here it* over the water.

this is an especially perfect solution while on the road and staying in a hotel. i guess it wouldn't work so well at the "riff raff inn" (mogo's economical chain of choice); they only have plastic cups.


* fyi: i jammed out to this.