Not on a phone... I have them on an MP3 player... You can set the MP3 player to play the same sound over and over and over again. So you could place it in a position and walk away from it and let it rip.. Many of the stores like Ross, TJMAXX, and Marshalls have add on speaker for the MP3 players.. As I'm typing this I am playing my mp3 player with a small speaker I purchased the other day.. cost me $4.00 for the speaker.