I currently have 7 smartphone lines, 3 of which have the bonus data (2GB/mo for the life of the line) due to upgrading those lines while that particular promo was available. After tooling around on MyVerizon for a few I noticed the familiar banner saying "We have promotions available for you!" (or something to that affect). I've clicked it before and it was just random stuff I wasn't interested in, like "get 1 gig free for trying GO90" and others, but I was bored so I checked it. Turns out they were offering me 2GB/mo/line on my other 4 lines as well! No stings attached. I figured it must be a glitch so I clicked to add it to my account. 15 minutes later I have 14GB/mo of bonus data (2GB x 7 lines) on my account. The only stipulations are that you are on a New Verizon Plan L or larger (8 or more GB per month) and you have a qualifying smartphone on the line to continue to receive that lines bonus. I'm not sure what they consider to be a qualifying smartphone, as I have a combination of 4 Note 5's, a Note 7, an iPhone 6s and an iPhone 7 plus, some paid off and some on payment plans and they all qualified.
TL;DR: Check that promo banner once in awhile on your Verizon account, sometimes there's some good stuff in there!
TL;DR: Check that promo banner once in awhile on your Verizon account, sometimes there's some good stuff in there!