Critics worry the tool lets phones double as spying devices, while the software maker says it is intended to help wireless carriers improve the performance of their handsets by communicating metrics.
Sprint says 26 million handsets are loaded with the monitoring program, while AT&T Claims it's on 900,000 of its phones.
Looking for a place where you can get things done--or be entertained--while waiting for a flight? We tested Wi-Fi quality and cell reception (and counted electrical outlets) at the 40 largest airports in the United States, to find the ones that do the best job of keeping you plugged in at the gate and in the air.
The lawsuit is the third to be filed since the privacy controversy started last week.
Handset makers and carriers scramble to explain the tracking software on some devices, while Congress demands details.
As Sprint upgrades to LTE from 4G WiMax, the move is expected to strain the carrier's network and unlimited data plans don't help.
If we don't actively protect our own data, does it matter if big businesses sell our personal details?