The Apple (AAPL) iPhone is 10 years old. The device not only turned Apple into one of the world's most valuable companies, helping to boost its stock price more than 700%, it also changed the way we invest and trade stocks.

In fact, the original iPhone -- and the current versions -- have an internal stocks app, allowing users to check the broader market indexes and individual stock prices.

Having this in your pocket was a big deal 10 years ago.

And financial firms didn't waste time jumping on board.

E*Trade (ETFC) launched its app in 2009 and soon after, mobile accounted for 1.2% of total trades. Today roughly 20% of trades on the platform come from a mobile device. The iPhone has even groomed a whole generation of investors addicted to checking the market's every move.

The TD Ameritrade (AMTD) Mobile Trader app launched in 2012 and user growth has soared 128% since then.

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