US launch details for the Galaxy S 4 are arriving at last, and both Sprint and T-Mobile are on the vanguard. The two carriers plan to sell Samsung's flagship for $150 in 16GB form, albeit with different pricing strategies: T-Mobile's plan includes its now-standard device payment installments, while Sprint is discounting the phone from its normal $250 price through a $100 instant credit. Just when you'll have the chance to plunk money down also varies. Sprint plans to offer pre-orders starting on April 18th, with an actual lau
