Carrier plans come and go. At any point, a carrier might choose to discontinue a plan it’s offering and replace it with another. You’ll usually still get to keep the old plan, but that will not stop that carrier from still trying to get more and more money out of you. Verizon has been guilty of this, increasing the price of its grandfathered plans several times in the past, and now the company is once again raising the prices of grandfathered plans.
Source : Verizon is Increasing The Prices of Legacy Plans (Again)
