Announced last month, MiFi is a wireless modem that emits a Wi-Fi signal to create a portable wireless hotspot wherever there's a 3G connection.
The battery-powered device measures 86x45x10mm and supports multiple Wi-Fi connections at the same time to provide web access to laptops and other gadgets in close proximity.
The first time a device connects to the wireless modem, the user will have to input an eight-digit network key. From then on the device will automatically connect with the modem.
"There are millions of Wi-Fi devices out there, but they can only be used in fixed locations. Consumer demand for easy and affordable internet access on the go is growing fast and we're responding to that by announcing the UK's first wireless modem," said Marc Allera, sales and marketing director at 3 UK.