Spec
here.
Saved my working life a couple of weeks ago when my home broadband was down.
I fixed the GSM Dongle to a fishing pole out of an upstairs roof window to get a GSM signal (4 meter USB extension lead), then ran the router into my home network. (The wifi signal was good, by my office is in an outbuilding).
Depending on the strength of the 3G signal, this may work for you, without the fishing pole, etc. giving you your own wifi. You could add range with and extender or ethernet cable.