Using an Archos 3G modem with an Acer Iconia tab (Android Honeycomb)

I've recently purchased an Acer Iconia tablet with Android 3.1. Then I adquired an Archos G9 3G USB modem, with the intention of having internet connection on my tablet when not around a wifi (90% of the time for me, sadly). I *thought* using it would be simple, like with a PC: insert the USB modem on the tablet, it recognises it, asks me some questions to configure it and so on. But no, when I insert the USB modem on my tablet it does **absolutely nothing**. I've searched on the net for instructions about this but haven't found any. Is this USB modem intended for using **only** with Archos tablets? Anyone on my situation?