America Online is expected to launch an Internet phone service in the United States next month, leapfrogging rivals in a fast-growing market as it seeks to evolve from an also-ran provider of dial-up Internet access to a broadband services powerhouse.

Like Yahoo and Microsoft, AOL already offers voice chat on PCs as a free feature of its instant messaging services. AOL's new phone service, by contrast, will take a different path, charging customers a monthly fee to make calls over the Internet using an ordinary handset and a small analog-to-digital telephone adapter.

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