Nott hat it matters but to anyone be it work at home that you have free WIFI access, if you had the 150mb plan that is grandfathered to anyone that had it can keep it even if you were switched to unlimited, This way you can use your wifi and keep the usage down.
All you have to do if you don't want the unlimited is call VZW and ask them to switch you to the 150mb plan for $15.00.
I got this from a high level manager I spoke to and this is what I am doing for now using wifi at work and home.