If this change upsets you, there's a thread going about it over here that you're welcome to join.
T-Mobile seems rather unresponsive on the matter (not even paying it the lip service that they're giving to the "Take back the beep" movement), so I wouldn't hold your breath for a positive resolution. Calling customer service or any of the T-Mobile numbers available on-line wouldn't be a bad idea, though, especially if you can get past the call-center employees to a real T-Mobile person.
The "going green" explanation that is the sum total of the official logic behind the change makes for a pretty thin cover story and it embarrasses me to hear people repeat it. The only "green" involved is the ink on the money that T-Mobile wishes to add to the balance book.
