Sprint is said to be readying the financing to make its long-expected bid for T-Mobile USA, if its parent Softbank decides to put ambition ahead of concerns about regulatory hostility. It may be encouraged to move by T-Mobile’s most recent quarterly results, which saw the fourth cellco’s ‘Uncarrier’ strategy bearing fruit, outdoing the three larger players in terms of net additions (2.4m, with 1.3m in the postpaid market where TMo has been weak in recent years, as has Sprint). For now, though, the two operators remain bitter rivals, both engaging in price wars in the prepaid segment where they have seen most growth, while chasing higher value customers with various strategic shifts. In Sprint’s case, the quest for a return…