I was playing with my Mikrotik at home (RB951G-2HnD) trying to learn more stuff and though I should put of some use to my 3G USB dongle (HUAWEI E220). This came in handy as next day my main connection had problems and needed a backup connection to the Internet.
PLUG IN THE MODEM
Plug the 3G USB dongle and check on Mikrotik using the CLI commands "system resource usb print". If it can recognize the 3G modem then you are ok .See the command output below :
