Nowadays, one of the hot topics among the smartphone (iPhone, Android, Blackberry, Symbian, ...) users is about Carrier IQ.
Carrier IQ is spy agent pre-installed in certain smartphone that can capture information about the phone numbers you are dialing, your GPS location, the webpages you have visited with your mobile browser, etc. Those information are sent back via the Internet without your notice, invading into your privacy.
Carrier IQ has been reported to be found in iPhones, and it is told that you can disable its information sending action with About > Diagnostics & Usage > Don't Send.
There are multiple vendors and multiple models for Android phone, and not all of them are affected. If you have an Android phone, good news is that now there are several free tools available in the Market for you to find out whether your Android phone is installed with the infamous Carrier IQ or not.
Just open the Market app, and search for the keywords "carrier iq detector" and you will get a list of the detector tools for Android.
Use them to check on your Android phone. You can install multiple of them to assure that your phone is not affected. Once you have done the checking, you can go ahead to uninstall the Carrier IQ detection tools.
If you find Carrier IQ in your Android phone, removal will be a bit tricky, as you need root access. There are apps such as Logging Checker (a.k.a. Logging Test App) that claims to be able to help you eliminate Carrier IQ in your phone.