In a deal that could make financial tools more widely available through mobile phones, the handset maker Nokia Corp. has bought a stake in the payments technology company Obopay Inc.

Obopay is one of several companies that have developed payments features for mobile phones, but a major hurdle in bringing banking capabilities to the mainstream market has been persuading users to download the applications or wireless carriers to deliver them preloaded in handsets. Analysts said that Nokia's minority stake in Obopay, announced Wednesday, would let the Finnish company hardwire the technology into its phones and could make it an important player in the global remittance market.

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