An alternative payments start-up says it is planning to offer an online micropayment system for cell phone users in the United States.

Paymo Inc. introduced its service four months ago, and it is now running in 39 countries. The San Francisco company said last week that it plans to bring the service to the United States in the next several weeks for customers of AT&T Inc. and Verizon Wireless and expects to have more carriers on board by the end of January.

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