Summary Box: Sprint's fourth-quarter report

: Sprint started selling the iPhone in October, joining Verizon and AT&T. It's an expensive project for a company already losing money.

WIDER LOSS: Sprint lost $1.3 billion, or 43 cents per share, its biggest loss in three years. Revenue rose 5 percent to $8.7 billion.

THE OUTLOOK: In another expensive project, the company is shutting down the Nextel network and building a "4G" network. Because of the big short-term challenges, analysts are wary of making long-term predictions for the company.

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