That would be awesome, thanks! I have a skeleton phone made up right now, but am still tinkering with it to make it work right.
I haven't added the timer function for the battery yet, I'll do that last as it seems the most complicated. I figure I'll made the phone capable of:
Dialing out to specific numbers
Receiving texts (obviously sending a text would be problematic, but I'm going to give it some thought)
surf the web for information - I'm thinking of something like "Search wikipedia for X", though probably won't use a real site's name
In the beginning, before you bring back power to where you are, you use it as a weak light source
There will be a mini-game on it to kill time
Once I get the cellphone set up with all the functions I'll make it available to everyone to use if they like. Once I get further along, I'll post it so you can see what I've done so far if you like.