I had what was their "top tier" Magenta Max plan.
Now with the newer plans they made, if I want to do a phone trade in or upgrade I don't get as good of a deal on Magenta Max. I only get the better deals if I'm on one of their new and even more expensive plans.
So right now they aren't (yet) forcing a price increase or making me switch plans, but they did make any future phones obtained through them more expensive for me to get.