By Dan Gallagher

Shares of MetroPCS Communications Inc. and Leap Wireless International Inc. made gains Tuesday after analysts said the stocks have been oversold on fears of a potentially new price war in the discount-wireless sector.

Both stocks had shed 20% of their value over the last couple of weeks after rival Tracfone, a unit of America Movil SA (AMX), launched a new service called "Straight Talk," which offers unlimited calling and text messaging for $45 per month on a prepaid basis. Investors had feared the move could spark a price war in the prepaid-wireless market.

But a pair of analysts said Tuesday that those fears may be overblown, and that the prepaid market has plenty of room for growth.

The sentiment helped MetroPCS (PCS) gain nearly 5% by early afternoon, while Leap (LEAP) was up nearly 4%. Virgin Mobile USA Inc. (VM) shares were down nearly 2%.

"At the end of the first quarter, there were nearly 50 million prepaid subscriptions in the U.S., but just 12 million of those - less than a quarter - were on an unlimited plan from MetroPCS, Leap or Sprint's Boost," John Hodulik of UBS wrote to clients. "As unlimited prepaid service becomes more widely available, we expect many traditional prepaid customers will switch, since the economics of traditional prepaid are inferior to those of unlimited prepaid."

Hodulik maintained his buy rating and $22 price target on MetroPCS, which was trading up 60 cents at $12.37 Tuesday afternoon. He said the company gets few of its customers through Wal-Mart Stores Inc. (WMT), where Tracfone's Straight Talk service will be sold.

Chandan Sarkar of Auriga USA upgraded Leap to a hold rating, citing the stock's lower valuation following the sell-off. He noted that Tracfone originally had experimented with a $30-per-month plan before adopting the higher-priced model.

"While some view the new plan as adding more pricing pressure to the U.S. wireless market, we view it as less severe than the worst-case scenario that would have unfolded if the $30 plan had been adopted widely," Sarkar wrote in a report. He said that Leap's share price "captures much of the bad news to come in wireless."

Leap shares were up $1.17 to $28.68 Tuesday afternoon. Sarkar trimmed his price target to $27 from $29 based on the lower valuation.

-Dan Gallagher; 415-439-6400; AskNewswires@dowjones.com