If you read The Motley Fool, then chances are good you have a brokerage account. And if you have a brokerage account, then chances are good you've received unsolicited phone calls from one of your broker's representatives -- be it E*Trade Financial (ETFC), Charles Schwab (SCHW 0.13%), TD Ameritrade (AMTD), or Bank of America (BAC -0.21%), just to name a few.

In the video below, I explain their motivation for doing so and the one thing you should keep in mind when they offer advice.