Nokia's Ovi portal is the launch pad for its offerings, and BlackBerry maker Research In Motion (RIMM) has carved out a niche with e-mail, and is branching into multimedia.

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In the now vast multimedia universe, that may be akin to sending a message via telegraph instead of e-mail.

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While the BlackBerry's plastic keyboard and tight integration with corporate e-mail systems makes it an unbeatable e-mail machine, Nielsen Mobile's first-quarter data show that the iPhone is all about multimedia, playing music, video and online games far above the average usage of those services for other mobile phone users.

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