The deal requires a consumer to provide a credit-card number online and delivers an iPhone 5S in the mail for use over the seven days, the company said. Return the phone to a T-Mobile store after seven days, and no charges will be assessed.
"We're not trying to make money on this," T-Mobile chief executive John Legere said at a kickoff event in Seattle.
The company hopes consumers who use T-Mobile's data network under the program will find that it is faster than their current carrier's network and switch to T-Mobile.
There is a grace period on returning the phone and "a little scratch" won't be a problem, Legere said.
T-Mobile has been attracting new customers with its marketing efforts dubbed "Un-carrier." Some of its changes have been adopted by the other national carriers, such as faster phone upgrades and equipment installment plans.
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