There are various community-created freeware to log and track your calls on your Windows Phone, and PhoneLog is one of those. It will log whom you called, the start time, end time, and duration of call within the Calendar application of your Windows Phone.

To download PhoneLog, click on.

The application does require .NET Compact Framework 3.5, which you can download and install direct from Microsoft.

(via: WMExperts)