Ringtones for Phones

You know in elementary, there was a kid who came in with a potato clock for his science fair project? Even though that was a long time ago, I wanted to do the same sort of thing with my cell phone. I was looking it up, and there was a video on how to charge my phone with a handcrank flashlight. That would be awesome, but I dont have time to sit there and crank my phone battery to life. I’d love an idea on how to do this more easily!!