Press and hold on the call log entry you want to delete. A menu will appear on the right. Tap on the garbage can to delete the call entry.
An alternate method if you want to delete multiple entries, is to go to the Hub, select Calls from the left menu, and then press the 3 dot button to bring up the right menu. Choose "Select More". Now you can choose whichever logs you want to remove, then select the trash can icon to delete.
I hope this info helps!
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