Check out this really cool Fireworks DIY that shows you how to make cellphone-triggered fireworks using a disposable cellphone. Sorta ghetto the way it looks right now but the theory is there and I am sure you could easily package it to make it look better.
With this tutorial you will be able to create cellphone triggered fireworks. Initially this was designed for a hobby rocket launch, but I found it was just as practical with fireworks . You call the cell phone, and it will auto ignite the firework/rocket for you with a fuse.