So unlimited data plans are not created equal, huh? If I'm assuming someone's contract I need to be sure the unlimited data is for 4G?
No, all you need to do is buy somebody's unlimited data plan and do the AOL before June 28th. Then you need to get a 4G LTE phone to put on that line. If the person you purchase the line from throws in a 4G LTE phone, great, if not, purchase one. Just switch to a 4G LTE phone as soon as you're able. Once you have the 4G LTE phone on your line, you can purchase the unlimited MHS. After you have the 4G LTE phone, I suggest getting one w/the same kind of sim card as your mifi has if you purchase a mifi, then you can just swap the sim from device to device whenever you want. However I personally find it too much of a hassle to swap sims daily, I just use my unlimited MHS feature and it is my home internet too. I live just outside a major metro area and cable internet is not an option. Plus whenever I go to work or out, I can just turn on the MHS and surf on my iPad or laptop.