Carrier IQ - Active Probes for Active Mobiles.

"Carrier IQ is embedding diagnostic software in the phone for the use by mobile operators to gain mobile service intelligence about devices that are in the field. The software logs everything from button presses all the way up to the software and applications on the phone and how the subscriber is using it... So while most probes are stationary, this is giving you real-time, in motion monitoring based on real usage, which is even better than drive-testing. Simon sites Sprint as a customer who has deployed this across several different phones and seen some interesting results."