The alternative payments start-up Paymo Inc. announced several deals Tuesday that significantly expand its reach and mark its debut in the United States.

The service the San Francisco company introduced in August lets customers charge online purchases to their cell phone bills. It said Tuesday that three mobile networks in the United States have agreed to carry its charges on their monthly statements: AT&T Corp., the T-Mobile unit of Deutsche Telekom AG, and Virgin Mobile, which uses the Sprint Nextel network to carry its signals.

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