Like the title states, you can upgrade your phone and maintain your unlimited data. You have to order your device online from Best Buy. Not sure if this works with other online retailers. Go on to BB's site and start the upgrade process. After you verify your eligibility, you shop for a phone & choose your new device. The next step is very important. When you get to the "Choose Your Plan" page, make sure you choose to "Keep Your Existing Data Plan". As an added precaution, I took screenshots of every step in case I need to fight with Verizon later. Continue on and once the order is complete, checkout. Now when you receive your new device, there are a couple important steps to follow. First, DO NOT POWER ON YOUR DEVICE! The new phone will have a preinstalled sim card. If you power on your new device before removing the sim, you will lose your unlimited data. Verizon programs the sim to force you into a tiered plan. The next step is to remove the preinstalled sim card from the new device. You will then take the sim card from the phone you are upgrading, and insert it into the new device. You may have to trim your current sim card to fit the new phone. I had to cut my micro sim down to a nano sim. I purchased a sim cutter from Amazon. It was easy & painless. Once the sim is inserted, you can power on the new phone. Your phone will activate and you will still have unlimited data. It worked for me and many others. You can read this thread for more info. Good luck.