I hate to be the bearer of bad news. But activation fee and upgrade fee are two different things.
-Will I also be billed an activation fee in addition to the upgrade fee?
No, you will not be charged the
activation fee in addition to the upgrade fee. The activation fee is a one-time charge billed when establishing a new line of service. The upgrade fee applies when you purchase a new device to replace an old device on an existing line.
I pulled that from
http://www.verizonwireless.com/support/upgrade-fee-faqs/
So if you open a new line then you shouldn't be charged a activation fee with the deal for online only but you still get charged a upgrade fee