The authorities in San Mateo County in California are considering whether to file criminal charges in connection with the sale of a missing next-generation iPhone belonging to Apple.

The San Mateo district attorney could act by early next week, according to people involved in the investigation. The office has the option of filing felony charges.

According to California law, if property doesn’t exceed $950, a case will be classified as a misdemeanor, but since the technology blog Gizmodo paid $5,000 for the device, a felony charge would be possible.

On Monday photographs and video of a possible next-generation iPhone, which is expected to be announced in June,appeared on Gizmodo.com. After some speculation about the authenticity of the iPhone, Apple’s legal counsel sent Gizmodo a letter asking that the device be returned. The letter stated: “It has come to our attention that GIZMODO is currently in possession of a device that belongs to Apple.”

Brian Lam, Gizmodo’s editor, said the organization had returned the device and that Gizmodo “didn’t know this was stolen when we bought it.”

In a New York Times article on Tuesday, Nick Denton, chief executive of Gawker Media, which owns Gizmodo, explained over instant message that Gizmodo paid $5,000 for the phone.

According to people familiar with the investigation,  who would not speak on the record because of the potential legal case, charges would most likely be filed against the person or people who sold the prototype iPhone, and possibly the buyer.

Gaby Darbyshire, Gawker’s chief operating officer, said in an e-mail message Friday that the organization had not been contacted by law enforcement officials, and declined to speak further on any legal aspects. Apple also declined to comment.

Stephen Wagstaffe, San Mateo County’s chief deputy district attorney, explained that “if there is any case that arises out of our office at this point the police have not submitted for prosecution.” He added: “We certainly know about what happened here in Redwood City” regarding the missing iPhone, “and we are the jurisdiction for any legal prosecutions” that could come out of the episode.

California law prohibits the sale of stolen goods and states that a person who uses someone else’s lost property without permission may be guilty of theft.

Mr. Wagstaffe said in cases like this it might not necessarily be a matter of lost versus stolen. In some instances of missing property, he said, “we call it misappropriation of lost property; it’s a crime but it’s not theft.” He added that “knowledge is a very important factor in a theft case.”

CNet reported on Friday that a task force, the Rapid Enforcement Allied Computer Team, had been investigating the case.

According to its Web site, the group is a computer task force made up of “17 local, state, and federal agencies, with the Santa Clara County District Attorney’s Office designated as the lead agency.” The purpose of the organization is to “arrest and prosecute a wide range of criminal offenders” related to high-tech business.

On Tuesday Yahoo introduced two new search iPhone applications at the C.T.I.A. conference in Las Vegas.

One of the apps, called Yahoo Search iPhone App, is an integrated search service for the Apple iPhone and includes a number of interesting features, including voice search and “Shake to Clear,” which does exactly what the name describes: clears the last search when you shake the phone.

The new app also offers a range of new local tools and features  that can refine a Yahoo search based on a user’s current location and also add relevant maps using location-aware technology.

The other new iPhone application is called Yahoo Sketch-a-Search.

The service works by allowing users to draw a boundary on a map around a specific location. The app will then bring up local content, including restaurants and businesses, without a user needing to know the name of an area or neighborhood. In addition, the app also filters restaurant results by cuisine, ambiance and star rating, Yahoo said.

The release of these new applications and other recent mobile content shows Yahoo’s continued efforts to stay involved in the growing mobile space.

In the early days of the Internet on cellphones, Yahoo was considered a thought leader, releasing numerous mobile applications around news, search, mail, and chat. Over the last several years, Yahoo’s competitors have quickly surpassed the company by releasing handsets, operating systems and entire ecosystems around devices.