Now, if the remaining gov't divisions and boards haven't been totally toadified, they should get into cell phone detectors in a big way! Our cell phone plans are the most expensive in the world, so this cost could be absorbed by introducing a bit more competition.
Other detectors, such a poison gas, smoke or carbon monoxide could eventually be built in. Really nifty would be a bird flu detector, but this is probably years away. The great thing about this is that it can be sold as personal protection, as well as social protection. If your phone detects radiation, then "Walk away from the light!". Naturally, you wouldn't want it to be sooo sensitive so that people whine about nuclear plants, flying, or enjoying freshly dug earth in the garden (quite a buzz!).
I also want earthquake sensors scattered around the world. They would only be useful if the phone was potted into a special charger for the night, like an iPod.