Have you ever wondered who you call the most or how many minutes you've used in a given billing period? You can log into your carrier's Web site to check, but why not use an app on your Android phone instead? With an app called Phonalyzr, you can. Here's how to set it up:
Install the app, Phonalyzr, from the Android Market.
Launch the app and hit the Menu Key to access settings.
Set your own billing date and your off-peak times.
Select what call data you'd like to view and even see SMS data.
That's it. Now you can check your minutes used, SMS usage, who you talk to the most, and other interesting call data.