Each week Ross Rubin contributes Switched On, a column about consumer technology. For T-Mobile, March went out like a lion, a roaring one. With passion for both invention and invective, T-Mobile roared against the contract during its UnCarrier announcement. The nation's fourth-largest (post-carrier) wireless operator will support its move away from contracts with a television spot that shows it as one of four bad guys riding into town to get people to do things their way, but then
