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I found this wonderful breakout board based on FT232. I wonder if I can use this board for connecting my arduino to a USB dongle for 3g/GPRS connection ?

From what I understand this board can be connected to the serial data pins of the arduino board. And if I connect the USB dongle to the FT232 board, I should be able to run AT commands from the arduino board.

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How exactly do you imagine connecting two USB devices to work? – Ignacio Vazquez-Abrams Aug 10 '14 at 9:35
Many don't realize that USB has distinct host and device roles; it's a common confusion, but yes, the answer is that it doesn't work. – Chris Stratton Aug 11 '14 at 16:17
up vote 5 down vote accepted

Unfortunately, no, as the FT232 would have to act as a USB host device. A USB host shield might work if someone has written driver code to support 3G modems.

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