For the first half-hour of the meeting, it was hardly surprising to see a potential client fiddling with his iPhone, said Rowland Hobbs, the chief executive of a marketing firm in Manhattan.

At an hour, it seemed a bit much. And after an hour and a half, Mr. Hobbs and his colleagues wondered what the man could possibly be doing with his phone for the length of a summer blockbuster.

Someone peeked over his shoulder. “He was playing a racing game,” Mr. Hobbs said. “He did ask questions, though, peering occasionally over his iPhone.”

But, Mr. Hobbs added, “we didn’t say anything. We still wanted the business.”

As Web-enabled smartphones have become standard on the belts and in the totes of executives, people in meetings are increasingly caving in to temptation to check e-mail, Facebook, Twitter, even (shhh!) ESPN.com.