By Thomas Gryta 

AT&T Inc. is pulling in more wireless customers, but at a price.

The telecom company said Tuesday it expects to add more than 800,000 of the industry's valuable postpaid customers in the second quarter, likely its biggest gain since the fourth quarter of 2009. But it also said half of its users of phones such as the iPhone are on discounted plans, and that two-thirds of those subscribers will be on such plans by the end of the year, a shift analysts said could reduce the long-term value of its customer base.

The impact is evident in AT&T's wireless revenue. The company expects to have added about 2.4 million postpaid customers over 12 months that will end in June. But the company is also reporting that its wireless-service revenue won't show any growth in the second quarter from a year ago.

The concern on Wall Street is that AT&T is adding customers now at the expense of cutting its service pricing across all of its postpaid customers. Citigroup analyst Michael Rollins estimates that excluding the acquisition of Leap Wireless earlier this year, AT&T's mobile-service revenue will be down as much as 4% for the current quarter.

"AT&T is trading away service revenue in the near-term to improve retention and customer goodwill," Mr. Rollins said. The carrier's shares were down 0.6% at $35.23 in afternoon trading Tuesday.

AT&T's pricing moves follow aggressive efforts by T-Mobile US Inc. to take customers by paying early termination fees and dropping charges like international data roaming fees that had annoyed users. The moves have worked--AT&T's monthly cancellation rate, called churn, is expected to be just 0.95% or lower in the quarter--and put the spotlight on Sprint Corp. and Verizon Communications Inc.

Verizon lost wireless-phone customers in the first three months of the year for the first time ever, and Sprint has been hemorrhaging subscribers for years. Sprint's shares were down 2.6%. Verizon's were down 1.7%.

Many AT&T subscribers are opting for plans where they pay for their own devices up front or via installment plans, forgoing subsidized devices in exchange for lower rates in some cases and faster upgrades. The new plans relieve AT&T of a costly burden, but the lower rates risk hurting its business.

"Subsidies may be lower; however, they won't be low enough to offset the pricing pressure," said New Street Research analyst Jonathan Chaplin, who argues subscribers' lifetime value to the company falls as they move to nonsubsidy plans.

AT&T said that its total revenue for the year will be up 5%. The gain reflects accounting for sales of unsubsidized devices, which are recognized all at once at the time of sale. The phone sale was previously largely bundled into monthly service revenue.

AT&T is holding a meeting with analysts in New York on Wednesday evening, including Chief Executive Randall Stephens and other top executives. Because of the pending $49 billion agreement to buy DirecTV, analysts covering that company have also been invited and more time was added for questions.

Write to Thomas Gryta at thomas.gryta@wsj.com

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