T-Mobile's Test Drive: Use an iPhone 5S to take a free spin on its network

T-Mobile is daring consumers to give its wireless service a whirl.

The nation's fourth-largest wireless carrier by subscriber on Wednesday unveiled a new program, dubbed "Test Drive," that would give people a week to test out its service for free. It is working with Apple to supply a pool of iPhone 5S units for potential customers to try out.

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