> "T-Mobile will never change the price you pay for your T-Mobile One plan," the company said in a pledge that enticed many people to switch plans or even switch from another carrier to T-Mobile.
I don't think it's reasonable to use anything but regular definitions for the words in that particular quote.
Rather, they are pulling this off a completely different way:
> "We are not raising the price of any of our plans; we are moving you to a newer plan with more benefits at a different cost."
So the price of the service is not changing during the reasonable lifetime of the service nor the lifetime of the consumer. Rather, the service is no longer being offered.