The following chart is financial services usage data across 230 million U.S. mobile phone users aged 18 or older (note 2) in the United States as of year-end 2012. It includes any type of financial content, secure or public (i.e. this is not limited to secure access by account holders).
The data shows that 62 million (27%) of mobile users accessed financial content during the prior month (Dec. 2012 figures). The vast majority of those (87%) accessed bank content. Credit card or electronic payments (e.g. PayPal) were each used by about half the segment. And brokerage or insurance content was accessed by about 20% of mobile financial users.
Observation: The banking numbers have been widely circulated, but I hadn't seen recent breakouts in insurance and brokerage. Both were surprisingly high, especially insurance. If you assume there is generally one mobile financial user per household, that means that about 10% of all U.S. households are using mobile insurance info. Same on the brokerage side.
Source: comScore, compiled Dec. 2012
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2. Users of any type of mobile phone, smartphone or otherwise. Also includes text-message queries.