The iPhone has been called the killer app for mobile banking, but online trading houses have been pushing smart phone technology the furthest, with E*Trade and TD Ameritrade releasing robust trading apps - first for BlackBerry, then for the iPhone - that are the most advanced mobile financial services on the market.

Smart phones, particularly the BlackBerry, have been a business staple for most of this decade. But this year they are poised on the edge of wide consumer adoption. "Among domestic consumers there's a conversation taking place around how to incorporate smart phones into daily life and daily business life," says Matthew Bienfang, senior research director, brokerage and wealth management at TowerGroup. According to the Kelsey Group, smart phones or data devices now comprise 19 percent of the U.S. consumer mobile market, and 50 percent of those surveyed said they intend to buy a smart device in the next two years.

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