The first cell phone running Google Inc.'s mobile software looks something like Apple Inc.'s iPhone and has a large touch screen, but it also packs a trackball, a slide-out keyboard and easy access to Google's e-mail and mapping programs.

Google made its debut as a cell phone software provider Tuesday at an event where wireless carrier T-Mobile said it will begin selling the G1 phone for $179 with a two-year contract. The device hits U.S. stores Oct. 22 and heads to Britain in November and other European countries early next year.

The phone will be sold in T-Mobile stores only in the U.S. cities where the company has rolled out its faster, third-generation wireless data network. By launch, that will be 21 cities, including New York, Los Angeles, Houston and Miami.

The data plan for the phone will cost $25 per month on top of the calling service, at the low end of the range for data plans at U.S. wireless carriers. And at $179, the G1 is $20 less than the least expensive iPhone in the U.S.