Mobile Wi-Fi is a portable modem that creates its own wireless hotspot, so is made for sharing. It works the same way as a home wireless router or Wi-Fi modem, but using a Three Mobile Broadband SIM. With Mobile Wi-Fi, you can connect up to five devices at once.
You get more flexibility with Mobile Wi-Fi than a dongle – for instance, you could put your Mobile Wi-Fi by a window to get the best signal and improve the reception around your house. You need a battery to run Mobile Wi-Fi so you'll need to charge it from time to time.