Hi Mate, i'm not 100% certain what you mean by mobile broadband, do you mean you have one of those cards that plugs into your laptop (like the voda phone red thing) or mobile broadband through a mobile phone provider like 3 or orange? In any case i'm fairly confident that your going to struggle to connect (i may be wrong and hope that i am) but i don't now of anyone who has plugged a usb connector direct into the ps3 (it has got usb ports) and played online.