I am on a family plan. My line has unlimited, but I was using the upgrade from a different line that has 2gb data. While pre-ordering the phone, I chose the 2gb data thing since there was no other option (and since that was what was true for the phone # I was using to order). When I picked up my phone, I was told I had to call Verizon to switch the activation from the line with the upgrade to my line. At the end of the call, I took the risk and asked the guy which data plan I had - I assumed I would be bumped to 2gb, but he said I had unlimited, and that he wouldn't flip the switch on me. Thanked him about a million times, and that was it! So basically...I didn't do anything "special" to keep unlimited. Beyond thrilled 😀