We are in our caravan and my cool Mobile WiFi modem is working well. A poor 3G signal in the caravan meant I could not get a connection. But by putting the modem in a plastic bag and attaching it to the top of our 8m telescopic flagpole I have a great internet connection (pity something similar can't be done to get a good TV signal without a satellite dish).
The Huawei E5830 wireless modem sends out a Wi-Fi signal to give you internet connection whenever you need it. With your own mobile Wi-Fi connection (known as MiFi®) so you can connect different Wi-Fi enabled devices at once and get fast internet speeds with no wires, no hassles and no need for a Wi-Fi hotspot.
I did manage in the past with my Mobile broadband dongle, but it meant extra hassle with a special 5m USB cable (5m is beyond the normal limits for a USB cable to this has a repeater to boost the signal) hanging out of the window.