In Japan, the codes did not become mainstream until the largest cellphone companies started loading the code readers on all new phones a few years ago. Now, millions of people have the capability built into their phones, and businesses, in turn, are using them all over — on billboards, street signs, published materials and even food packaging.

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In the late 1990s, several dozen start-up companies tried to create devices that would scan print content and ads and then reveal extra information to the reader. But consumers balked at using a special device only to interact with publications.

But now the time seems right for cellphones, ubiquitous and increasingly sold with cameras, to be pressed into service as the scanners.

“There are three things you tend to carry — your keys, your wallet and your phone,” said Rishad Tobaccowala, chief executive of Denuo, a unit of the Publicis Groupe that focuses on emerging and future technologies. “I can see something in advertising in one place, scan it with my phone and recall it later when I am shopping. Or, imagine, I can buy it using my phone.”

About a third of the 84 million households with cellphones in the United States have phones that have cameras on them, according to Forrester Research, and that number is expected to grow as consumers replace their phones. But few people with those phones have downloaded the software to read the codes.

In Japan, some highway billboards have codes large enough for passing motorists to read them with their phones. Hospitals put them on prescriptions, allowing pharmacies to instantly scan the medical information rather than read it. Supermarkets stick them on meat and egg packaging to give expiration dates and even the names of the farmers who produced them.

One of the most popular uses in Japan has been paperless airline tickets. About 10 percent of the people who take domestic flights of All Nippon Airways now use the codes on their cellphones instead of printed tickets.