Sorry I can't answer the question directly but these are just another batch of Chinese modems like the rubbish E160, E169s before them. Better to source your own modem. If you go with O2 avoid PAYG deals - contracts allow changing the settings to bypass the proxy and get faster speeds. I would be amazed if these MF100 things get anywhere close to HSDPA in real terms, let alone HSUPA. Notice the modem costs zero on a one month contract? They probably cost O2 peanuts as well which means you'll probably get what you pay for - something to discard.
Option ICON 505 on O2MB monthly plan bypassing the proxy:
PS A good modem can't solve connection issues so don't expect more than the standard of the network where you're connecting from. The above is a typical performance in WC2H London.