Generally, when you become a subscriber at will i.e. not liable for any agreement, you can keep whatever arrangement and pricing you have had all along as long as you don't change anything in the plan. This is called "grandfathering." Modifying the plan in any way may subject you to losing any features or pricing you had. I'm on a plan that has long since gone away over five years ago.
I had a similar situation with a land-line residential phone. I got a promotional $15 unlimited long-distance plan. A year later, I moved to another house 3 miles away in the same town. Both locations are served by the only central office in the town. No problem keeping my old phone number. But they would not let me keep the $15 long-distance plan.
Cabling-Design.com Forums website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.