An Assumption of Liability only requires the account holder to sign up for a new plan. All the other features on the account are carried over, since they are tied to the line. They may however ask you or encourage you to sign up for new features, but it is by no means required that you do so. You would still hold onto your grandfathered data if you did the AOL. Of course, VZW changes it's policies on a regular basis to best fit their business strategy, so this may not always be correct, but as it stands right now, that is the case.