Any possible way to keep unlimited data?

I would like to upgrade from iphone 4s to iphone 6 plus, but is there any way to keep unlimited data plan, without purchasing the phone at retail price?

Added (1). carrier is verizon, if it matter

One of 2 things would happen. Either you get to keep your unlimited data plan by being grandfathered in, or they basically give you no choice but to change that in order to get the iPhone. More than likely it'll be the latter.

J again, No. They make money, not friends. A corporation doesn't need friends. Try the steps below form just last month. Best luck.
http://www.droid-life.com/2014/09/25/upgrade-verizon-keep-unlimited-data/

http://www.droid-life.com/2014/08/10/unlimited-data-users-losing-another-upgrade-workaround-at-verizon-come-august-24/