Apple Inc.’s iPhone is sold out at its online stores in America and Britain, a sign that a new model with faster Internet access may be introduced soon.

“We’re currently out of stock,” an Apple spokeswoman, Natalie Kerris, said yesterday in an interview. Both the 8-gigabyte and 16-gigabyte models are unavailable. She declined to say when Apple will replenish inventory or comment on supply at retail stores.

The shortage suggests that the chief executive officer, Steve Jobs, is readying a new model, which may be unveiled during his speech at Apple’s developer conference on June 9, an analyst of Piper Jaffray & Co., Gene Munster, said yesterday in a report. Apple’s wireless partner in Britain sold out on May 8 after cutting prices, and the Web-surfing handset is in short supply at the company’s retail outlets in America, he said.

“The channels are running dry,” Mr. Munster, who is based in Minneapolis and recommends buying Apple shares, said. “The limited availability is one of several indications that the release of a new model is imminent.”

Apple, based in Cupertino, Calif., rose $4.71, or 2.6%, to $188.16 at 4 p.m. New York time in Nasdaq Stock Market trading. The shares have fallen 5% this year.

AT&T Inc., which distributes the iPhone exclusively in America, has the device in stock at its retail stores, a spokesman, Mark Siegel, said.

Mr. Jobs, who has forecast sales of 10 million iPhones for this year, is expected to unveil a model that supports faster downloads from the Internet over so-called third-generation networks, Mr. Munster said. The device, which includes an iPod music and video player, may have a switch that lets users turn on 3G access when they want faster data speeds, and shut it off when they want to conserve battery power, he said.