BARCELONA, Spain  Toru Arakawa, chief executive of Access, the biggest cellphone software company in Japan, took a diplomat’s view of Google’s foray into telecommunications.

The open and free platform that Google wants developers to use for cellphones, called Android, “is not necessarily something we have to fight against,” Mr. Arakawa said.

“My personal view is maybe there’s a way to work together.”

But Mr. Arakawa, who came to the mobile industry trade show here this week from a country that knows a thing or two about cellphones, seemed to be in the minority.

Google did not even have a booth at the trade show, Mobile World Congress, and its executives met quietly in modest off-the-beaten-track hospitality suites. But the Internet giant cast a shadow over the conference, with one executive accusing Google of “a land grab” for customers and advertising dollars, and a rival saying that Android would never be secure enough for cellphones.