By Ryan Knutson and Ben Fox Rubin 

Sprint Corp. said its first-quarter loss narrowed, as revenue improved slightly and costs declined, though its number of contract customers shrank.

The carrier said it lost roughly 750,000 of the most profitable phone customers in the quarter. The losses were offset by 516,000 tablet additions, bringing total losses of the most profitable postpaid customers to 333,000.

Sprint has been losing customers each quarter for more than two years, initially largely due to the shutdown of its aging Nextel network and more recently due in part to a massive network overhaul that has resulted in more dropped calls in areas where construction is taking place.

Executives said that network overhaul is nearly complete, and Sprint hopes to begin adding customers in the second half of this year. In areas where the network upgrade is more complete, customer defections have declined significantly, Sprint Chief Executive Dan Hesse said on a call with analysts.

It appears AT&T Inc. and T-Mobile US Inc. will be the winners in the war for subscribers this quarter. Last week, Verizon Communications Inc. said it lost phone customers for the first time, while AT&T had much stronger results. T-Mobile reports its first quarter results Thursday.

For the quarter, Sprint reported a loss of $151 million, compared with a year-earlier loss of $643 million. Revenue edged up 0.9% to $8.9 billion.

Operating expenses shrank about 3.5% to $8.46 billion.

Sprint's revenue per user fell from a year earlier. Executives said more than a million customers have adopted the company's "Framily" plan, which offers price reductions as more people are added to a cellphone plan.

Sprint hopes revenue per user will improve as it persuades customers to buy insurance plans, upgrade to unlimited data and buy tablets, Sprint Chief Financial Officer Joe Euteneuer said in an interview.

Sprint also said 29% of the people who bought devices in the quarter did so without the help of subsidies--a trend that was pronounced at AT&T as well. Mr. Euteneuer said this trend will help the carrier save on marketing costs and shifts pressure for selling devices away from the carrier onto phone makers.

The shift could ultimately put pressure on sellers of expensive phones like Apple Inc., though Apple sold a surprisingly large number of iPhones in the quarter.

Sprint and smaller rival T-Mobile have been considering a possible acquisition, but no formal tie-up has been proposed. Both cellphone carriers could face significant antitrust issues, as regulators have made clear they will oppose more deals in the wireless market.

Despite that challenge, Sprint Chairman Masayoshi Son has said a combined company could help lower prices for customers and create a substantial competitor against market leaders Verizon and AT&T.

Last week, federal regulators outlined plans to modify a so-called "spectrum screen" that would make it more difficult for Sprint to do deals with other companies or acquire more spectrum. Mr. Euteneuer said there were a lot of moving parts to the government rules and declined to comment on how it might affect future transactions.

Mr. Hesse also declined to comment on the possibility of a Sprint deal with T-Mobile, only reiterating past statements that consolidation "would yield a more competitive industry and would be good for consumers."

Sprint's loss of 333,000 net postpaid subscribers--the industry's most lucrative phone customers--compared with losses of 69,000 in the fourth quarter and a loss of 560,000 a year earlier. Total wireless net losses were 467,000, compared with a gain in the prior quarter, because of declines in prepaid and contract customers, though wholesale and affiliate customers rose.

The total postpaid customer turnover rate was 2.18%, compared with 2.09% a year ago.

Write to Ryan Knutson at ryan.knutson@wsj.com and Ben Fox Rubin at ben.rubin@wsj.com

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