Microsoft and Sun Microsystems have strengthened their lineup of products that allow cell phone companies to bill for downloads such as games or ring tones.
The moves signal a new battle brewing between the two software heavyweights to win a dwindling share of spending by cell phone service providers.
Providers are turning to downloads as a new revenue source. But most have billing systems that are a jumble of sometimes decades-old software, the result of mergers of different phone companies that created modern giants such as Verizon Communications and Verizon Wireless.
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