Make sure you are logged into the My Verizon account that is registered as the main account owner.
when you get logged in, you will see My Verizon in the thick red bar, hover over that and click on the link in the drop down box that says VIEW BILL.
When that loads, you will see a drop down box with your latest bill in it, click that and you can select what month you want to view. Then click on the Charges By Line tab, and then you can choose the number you want to view and see all minutes, text and data used.
Hope this helps!!