Launch DC-unlocker software, make sure your dongle is detected - if it's detected, details will be visible on the bottom of the program

Note: accessing support area is possible from all DC-Unlocker softwares. More info here

Click "Access support area" button on DC-unlocker software's "About" tab

On support area page select "History" in top menu

Details of dongle usage history will be printed out. Following information will be possible to see - Date/Time/Operation/IMEI/Credits used/Result - either OK or ERROR