On the dashboard I can click details and see a summary of usage by device. Then I can click a device and see the details. On the billing, I can only see the details. No device summary.
I added my 13 year old to our plan. I need to see a summary of her usage so that i can bill her when she doubles+ our data usage :) But I'd rather not have to add up each individual entry. The day before the bill closed, I *could* have gotten the summary that I need but I can't find it now on the closed bill.