Heads up, T-Mobile customers! Capital One just dropped a brand-new credit card in partnership with the mobile carrier. If you're a T-Mobile devotee, the T-Mobile Visa card could be a game-changer for racking up rewards on purchases you're already making. The card lets you earn "T-Mobile rewards" which can be used to pay your phone bill or to get new phones and accessories. You'll earn these rewards on T-Mobile purchases and everyday spending. If you spend a lot on T-Mobile services or are planning to upgrade your phone soon, this card could be a valuable addition to your wallet.