The wireless mobile phone service is a highly lucrative business. Now the competition is heating up with the expansion of service from Wal-Mart Stores Inc. (NYSE: WMT) service.
Walmart will offer prepaid mobile phone service for $30 for 1,000 minutes and $45 for unlimited calling. Walmart will expand service to 3,200 stores from 234. Response to the initial launch was "overwhelming," said Walmart.
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