The problems with phones these days is that they cost too much, need batteries, are a hassle to maintain, and get effected with extreme temperatures. A sound powered phone can turn the sound waves of your voice into energy and can come out the other end of the line. There are no batteries so they are energy efficient and you don't need to charge them. If they get wet, cold or even a wire gets melted they will still work, unlike cellphones. So can voice powered phones really be the future of conversation?