If you have some sort of smartphone (Blackberry, etc.) or iPhone, then you can probably dig up an app somewhere. If its just a regular phone the likelihood is slim. Most regular phones don't run on any real kind of "software". They mostly just use whatever firmware they're given, which is a lot harder to make changes to, if its possible at all

Edit: I should append that this is merely from my understanding. I've done plenty of research on customizing a few cell phones, but I'm really not any kind of expert