Lifehack - Trick with Guitar and iPhone (Android or MP3 player)

Amazing guitar lifehack trick with mp3 player or iPhone or Android from http://hard-guitar.com/ (by Mykola Yermolenko) What will happen if connect electric guitar pickup (single coil or humbucker), headphones and mp3 player (ipod, iphone or Android phone)? Watch this video and check out! Probable you will not need speakers anymore, because guitar AMP will make a great sound instead.