Is Myxer.com free if I have an unlimited data plan?

Question about Verizon unlimited data plan and adding new line..

• We're thinking of adding another line to our family Verizon plan - currently we have 3 people month to month, grandfathered in on unlimited data. Will we lose that if we add a new line/purchase a phone through them? So we have two iPhones and an Android phone on the old Verizon unlimited data plan. We purchased our iPhones at full price in order to keep this plan, so it's pretty important to us. (One of the three of us pretty regularly goes over the current data limits, so if we downgraded, it would actually affect phone usage.) However, we'd like to add a phone/line for our niece. we could go with prepaid, and a separate account, but it would wind up being $50/month with no controls. If we could add it to our current plan, I think we could set up family controls (and lock the phone down at night, set limits on minutes/data, etc). Has anyone been in this situation? Will we lose our unlimited data if we try to do this? I went through part of the process online, and it looked like the answer was yes. I don't trust the reps in the store to know whether or not, or to have our best interest in mind. I'm open to the possibility of purchasing her a phone off ebay or secondhand instead of through Verizon. She'll be in a semi-remote area, so we think Verizon coverage would be best, although we're open to other suggestions.

• Answer:

  I just (last month) added my daughter to our family plan and lost my grandfathered unlimited data. Making ANY changes to your plan (upgrading your phone, for example) will make it go away. Even if you purchase a used phone, adding the line will make it go away. I went to the store to try to keep it, and was soundly shot down.