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Missing from Leap’s iPhone lineup is the 3GS, an older model that’s still sold by AT&T. It’s cheaper than the newer models, but doesn’t work with Leap’s or Sprint’s networks.

Verizon Wireless, AT&T Inc. and Sprint, the three biggest cellphone companies in the U.S., already sell the iPhone, as do a half-dozen smaller, regional phone companies. The biggest companies that don’t carry it are T-Mobile USA and MetroPCS Communications Inc. U.S. Cellular Corp., another regional carrier, said it turned down the chance to sell the phone because of its cost.