Sprint Nextel Corp.'s (S) first-quarter loss narrowed as average revenue per contract user edged up, helping the wireless carrier post a slight revenue increase.

Steep customer losses and costs from the shuttering of its older Nextel network have widened Sprint's losses in recent quarters.

Last week, satellite-television provider Dish Network Corp. (DISH) made a $25.5 billion bid for Sprint in an effort to derail the No. 3 U.S. wireless carrier's roughly $20.1 billion acquisition by SoftBank Corp. (9984.TO) of Japan.

Sprint had also agreed late last year to buy the half of Clearwire Corp. (CLWR) it doesn't already own in a $2.2 billion deal, but Dish soon after made an informal offer that valued all of Clearwire at about $4.85 billion. Dish has yet to move forward with a formal bid for wireless-broadband provider Clearwire.

Sprint reported a loss of $643 million, or 21 cents a share, compared with a loss of $863 million, or 29 cents a share, a year earlier. Revenue edged up 0.6% to $8.79 billion.

Analysts polled by Thomson Reuters had most recently forecast a per-share loss of 33 cents on revenue of $8.71 billion.

Operating margin swung to 0.3% from negative 2.9%.

The company lost 560,000 net contract subscribers in the first quarter, compared with losses of 243,000 in the prior quarter and a loss of 192,000 a year earlier. The Sprint brand added 12,000 contract customers while the Nextel platform lost 572,000 contract subscribers. Sprint said the Nextel network is on track to be shut down at the end of the second quarter.

The company ended the quarter with 55.2 million total customers, down 1.6% from a year earlier.

The total contract customer turnover rate was 2.09%, compared with 2.18% in the prior quarter and 2.01% a year ago. Average revenue per contract user rose 4.3% to $62.47 from $59.88 a year ago.

Sprint sold about 1.5 million iPhones during the quarter with 43% going to new customers.

Shares closed Tuesday at $7.10 and were inactive premarket. The stock is up 25% since the beginning of the year.

Write to Melodie Warner at melodie.warner@dowjones.com

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