Sprint is making an aggressive play to attract new iPhone users. When Apple's latest handsets launch September 20th, the carrier will cut $100 from the iPhone 5c and iPhone 5s for new customers porting a number over from one of its rivals. The $100 off deal applies to any phone in the carrier's lineup, but is surprisingly also valid for the new iPhones. That means you'd be able to secure a 16GB iPhone 5c in any color you'd like for free on-contract. And the flagship iPhone 5s comes to just $99.99. It's a better deal than any we've seen from other US carriers — or Walmart, for that matter.

T-Mobile will offer the 5c for $0 down and the iPhone 5s for a similar $99 downpayment, but only for customers that sign up for its Jump upgrade program. Sprint's savings are instant if you're willing to sign a two-year wireless agreement. Like Verizon, AT&T, and T-Mobile, the company is reportedly prepping an upgrade plan of its own for launch September 20th.