Either that or they don't change the rate for Mint, at least for a while, and keep their own rates the same knowing that most T-Mobile customers either won't pu

Either that or they don't change the rate for Mint, at least for a while, and keep their own rates the same knowing that most T-Mobile customers either won't put in the effort to switch to Mint or be totally oblivious to the whole thing. And they now have greater control. For T-Mobile, they win no matter what. They can afford $1.5 billion.