Three was the UK’s first mobile 3G broadband provider, and since launching in 2003 it has won 3.5 million customers. It’s the UK’s smallest mobile network operator, but the only one with a network dedicated to 3G, and it’s currently conducting a trial of next-generation 4G mobile broadband, which it claims will give real-life speeds of up to 10Mbps.

As with most mobile broadband providers it offers SIM-only deals for tablets and laptops with a built-in 3G modem and 3G USB dongles which plug into your laptop. There are two USB dongles - a standard stick and a premium stick which can fold out of the way to save space in crowded places like trains.

Three was the first UK operator to offer a personal wireless network device, called MiFi, which can supply a 3G connection via WiFi networking to up to five devices. If you just want a personal network at home, Three has a Wi-Fi Hub which extends your USB dongle to up to five devices, just like MiFi.

Three - MiFi

Pay-as-you-go deals come in 1GB, 3GB and 12GB options, with the capacity lasting longer the more you buy, while there’s a 48-hour top-up as well as larger top-ups lasting 30-day.

Contract options start with one-month rolling contracts which can be cancelled at any time, plus18-month and 24-month contracts, but no 12-month contracts. Usage limits range from 1GB/month to 15GB/month, and the high-end 15GB option includes the potential for a bundled copy of Microsoft Office.

It also offers deals on the iPad2, HTC Flyer and Samsung laptops, where customers can get a discount on the upfront price against their broadband contract cost, and are quite good value.

Ofcom’s 2011 customer service satisfaction survey was a mixed result for Three, which saw more customers contact the company during the research period than any other provider (39 per cent), and a higher proportion of complaints and fault issues than average. At 63 per cent, it had the lowest number of customers saying they were satisfied, although only 11 per cent said they were dissatisfied, making it the fourth worst out of five.