NEW YORK — 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.

In other areas, people will be able to buy the phone from T-Mobile’s Web site. The phone does work on T-Mobile’s slower data network, but it’s optimized for the faster networks. It also can connect at Wi-Fi hotspots.

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.

Larry Page, Google’s co-founder, said the mobile phone industry was a tremendous opportunity for Google.