There are a number of advantages to the grandfathered unlimited plans that are kinda complicated. Basically, there are fewer restrictions on the kind of devices

There are a number of advantages to the grandfathered unlimited plans that are kinda complicated. Basically, there are fewer restrictions on the kind of devices you can use the SIM cards in, and the scenarios where they can throttle you are different. Some plans also include subsidized device upgrades every two years.