SAN JOSE, Calif. — While most iPhone owners couldn't wait to try out their pricey new gadgets, a few raced to break them apart.

The dismantled — and in some cases, permanently busted — iPhones revealed one of Apple Inc.'s closely guarded secrets: the names of the companies that supplied the chips and other electronic components for the highly anticipated device.

The findings sent all but a few of the component makers' stocks higher yesterday, the first day of trading since the iPhone — a combination cell phone, music player and wireless Web browsing device — went on sale in the U.S. Friday evening for as much as $600 a pop.

The parts makers stand to profit handsomely if the iPhone proves popular over time. Apple itself has set a target of selling 10 million units worldwide by 2008, gaining roughly a 1 percent share of the cell phone market.

The phone was sold out in most Apple and AT&T stores by yesterday afternoon, said AT&T spokesman Michael Coe. He declined to release specific sales figures.

Coe added that most of the activation problems that surfaced over the weekend had been resolved. Some iPhone buyers had trouble switching over to AT&T from their previous wireless carrier, delays that AT&T blamed on overloaded servers, a problem with the company's credit authorization system, and problems transferring customers' business accounts to consumer accounts.

"The issue is essentially behind us now," he said.

But as that problem passed, another glitch emerged. Some iPhone users in Western and Midwestern states were unable to get onto the Internet for several hours yesterday because of outages on AT&T's EDGE network that were eventually fixed, Coe said. AT&T said it had not determined what caused the outages but was certain it wasn't due to an influx of iPhone users.

Despite the problems, investors flocked to the iPhone's newly unmasked parts makers.

Among the beneficiaries of Apple's business and the tear-down buzz were semiconductor heavyweights Intel Corp., Broadcom Corp., Texas Instruments Inc. and Infineon Technologies AG as well as lesser-known companies such as Skyworks Solutions Inc. and Linear Technology Corp.

Some researchers said Apple's secrecy surrounding the iPhone's component suppliers is yet another example of the Cupertino-based company's vaunted ability to keep their partners tightlipped even when facing a media frenzy and rampant speculation.

The secrecy continued yesterday. Most of the component makers either didn't return phone calls or declined to comment.

Based on the results, one of the biggest winners is South Korean chip-maker Samsung Electronics Co., which is making the main microprocessor used to run the phone's operating system and various applications. Samsung, the world's largest memory chip manufacturer, is also making a type of memory called NAND flash for the iPhone.