Katie Watson, a Google spokeswoman, declined to comment on the company’s plans. She referred reporters to a blog post published Saturday in which Google said that the new device was a “mobile lab” that would let employees test out new technologies.

Google employees who spoke on the condition of anonymity because plans for the phone were supposed to be confidential said that the device, manufactured by the Taiwanese company HTC, was thinner than Apple’s iPhone, with a slightly larger touch screen. It could be available as early as January, they said.

Employees say the phone will be sold unlocked, meaning that buyers will be able to choose a service provider, and will be based on G.S.M. technology, which is used by AT&T and T-Mobile in the United States and by most other carriers around the world. It is named Nexus One, according to various reports and to digital traces that the phones have been leaving on Web sites.

Google had long insisted that it was not interested in building and selling phones, saying it preferred to rely on hardware partners and wireless carriers to market a wide variety of phones powered by Android, the operating system that it offers free.

In October, Andy Rubin, vice president of engineering for Android at Google, scoffed at the idea that the company would “compete with its customers” by releasing its own phone, according to the technology news service CNet.

Analysts say that the apparent shift signals a recognition by the company’s executives that Google needs to take more control of its destiny in the wireless world.

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“They perceive mobile as the next major opportunity,” said Jeffrey Lindsay, an analyst at Sanford C. Bernstein. “It is too big a risk to drive the strategy through their partners. They want more say and more control.”