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If there has ever been a time when you wanted to easily look a year back and see if someone called you on a specific day, you will appreciate this app. With different needs for a call log, like a credit card company dispute or heaven forbid a relationship dispute, keeping a detailed log of phone calls can be a very important matter.
CallTrack for Android phones is a solution for this issue that takes advantage of Android's unified Google experience and puts it to use. The app does nothing more than track every call that you receive or make, depending on your settings, and sends those as an event into your Google Calendar.
The app lets you choose a calendar to sync to and choose what type of call to sync. It worked perfectly in my tests. It seems to be missing a few features that would be nice such as the ability to choose a specific number to sync instead of every call. But as an overall experience, this app worked wonders. It's available for free in the Android Market so check it out and start logging your calls.