What processor will the iPhone use? That\u2019s one of the great unanswered questions left in the wake of Apple\u2019s launch of the iPhone this week, but a job ad on Apple\u2019s website may hint at the answer.The open position is a networking engineer to work on the iPhone, and as the ad makes clear, Apple is looking for someone who knows the Mac OS and embedded platforms, and Arm processors in particular.\n\n\n\n\n\n\n\n\n\nThe Apple iPhoneAn Arm chip would be the logical component for a device like the iPhone. Arm is already the dominant provider of smart-phone application processors, because its chips are powerful enough to meet the computing needs of these products while at the same time requiring little power\u2014a critical component to keeping the phones running between charges.If the iPhone\u2019s brain is Arm-based, it will represent a new direction for Apple\u2019s Mac OS X operating system, which will power the device. To date, Mac OS has been ported to Intel\u2019s x86 processors and IBM\u2019s PowerPC, but Arm would represent a third platform for Apple\u2019s operating system.On the other hand, it is possible that Intel or IBM could develop new processors that would meet the iPhone\u2019s requirements, saving Apple from doing the porting work to make Mac OS run on the new platform, said Peter Glaskowsky, technical analyst with the Envisioneering Group. "To me the number-one unresolved question about the iPhone is: Does it use an Arm with a port, or does it use some new PowerPC or x86 chip?" he said.Glaskowsky said that even if Apple is looking for Arm skills, that doesn\u2019t necessarily mean that Arm will be powering the iPhone\u2019s operating system. "I wouldn\u2019t read too much into that," he said of the ad. "If you think about most modern smart phones ... it\u2019s very common for them to have four processors in the device."Apple could be using an Arm chip to do something like voice compression or to simply process wireless networking signals. (Apple\u2019s ad is for a "Bluetooth\/WiFi" software engineer.)"It may have nothing to do with what\u2019s running Mac OS on there," Glaskowsky said.-Robert McMillan, IDG News Service (San Francisco Bureau)Related Links:\n\nWhy Apple i-Anything Is a Non-Issue for CIOs and Corporate America\n\nCisco Hits Apple With Lawsuit over iPhone Name\n\nApple, Cingular Partner on iPhoneCheck out our CIO News Alerts and Tech Informer pages for more updated news coverage.