Wal-Mart Stores and Target have joined more than 20 retailers in setting up a mobile-payment operation that would compete with both Google Wallet and the Isis venture backed by three major U.S. carriers, according to a published report. The report suggests retailers are eager to establish their dominance in benefiting from the new technology. Also, Sprint Nextel may expand its relationship with Google by introducing up to 10 additional smartphones that would support the Google Wallet system, according to an online report, which says Google is in talks with carriers worldwide about adopting the mobile-payment technology.

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