WASHINGTON - It's a Post Office on your phone. Customer convenience and product access are the focus of expanding the most popular online services onto web-enabled mobile devices.

Some of the most popular functions currently available on usps.com are now available on cell phones and other mobile devices. The new features include Track & Confirm, Post Office locator, and the most popular application, ZIP Code lookup.

With more than 232 million mobile communications devices in the United States - a growing number of which can access the web - the promise of Internet access from virtually anywhere in the country is fast becoming a reality.

"Our new mobile capability makes USPS services even more convenient for our customers," said Robert Bernstock, president, Mailing and Shipping Services.

Any mobile user with web access will be able to log on to the Postal Service mobile site no matter where they are, without having to use a personal computer, Bernstock said.

"If they're on the road, they'll be able to use the Post Office locator function to find a Post Office that's close to them. And they'll also be able to track and confirm delivery of their mail or packages using their mobile phone," he said.

The Postal Service is also designing applications for "smartphones" and other mobile devices like the Apple iPhone, BlackBerry and iPod Touch which take advantage of additional capabilities, such as GPS.

Mobile applications make it easier for customers to interact and transact business with the Postal Service. These applications are the latest in a series of enhancements, upgrades and solutions designed for Postal Service customers.

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An independent federal agency, the U.S. Postal Service is the only delivery service that reaches every address in the nation, 149 million residences, businesses and Post Office Boxes, six days a week. It has 34,000 retail locations and relies on the sale of postage, products and services, not tax dollars, to pay for operating expenses. Named the Most Trusted Government Agency five consecutive years by the Ponemon Institute, the Postal Service has annual revenue of $75 billion and delivers nearly half the world's mail.