Why T-Mobile made the change is unimportant to me. I care that they made the change, and that they committed to it via zero lock-in contracts. If I feel that I'm not getting sufficient value at some point in the future, I can simply walk away from T-Mobile without spending $325/line in termination fees.
And as for the network, I'm fortunate that it's not a trade-off for me. T-Mobile's coverage has proven superior to AT&T's for my precise work/home/travel combination.
And as for the network, I'm fortunate that it's not a trade-off for me. T-Mobile's coverage has proven superior to AT&T's for my precise work/home/travel combination.