It gets pretty expensive to do that if you have more than one bag. Plus a dedicated tracking device can be smart enough to detect plane takeoff and landing, and shut down during that like the FCC wants everything to do. Plus much better battery life.

Plus if you live in the US and are trusting your pricey, covetable electronics to your checked bags and the underpaid TSA inspectors, you are much more trusting than I am.

For a similar product with an actual presentation, see http://www.indiegogo.com/blutracker/