Verizon is once again offering an additional 2GB of data per line when adding or upgrading a device to an XL or larger data bucket. In order to get the free data, which is good for the lifetime of your account, you need to be on Verizon's XL or XXL data buckets. The XL plan comes with 12GB of shareable data, while the XXL bumps it up to 18GB. For each line that you add, or upgrade the hardware on, you can receive an additional 2GB of data on either of these plans.
Full story from the WindowsCentral blog...