Find out everything you need to know about mobile phone networks in our networks guide.
The sheer range of carriers competing for consumers' business means that the UK mobile phone market is one of the most developed and competitive in the world.
UK carriers are split between large carriers who've invested heavily in networks and own a network of their own and smaller carriers who rent a network from their larger rivals, which are known as Mobile Virtual Network Operators (MVNOs).
Here, we look at some of the differences between the largest carriers and give a brief look at what they offer and what distinguishes them from each other.
If you're interested in finding out about smaller carriers, or MVNOs, you may find our guide to MVNOs more helpful.
Not sure if a carrier is an MVNO? Handily, the guide includes a full list of MVNOs and details of which network its service is based on.
The major UK mobile phone networks are:
Three was the first UK mobile phone network to offer 3G coverage and now offers extensive 4G coverage. Traditionally, it has targeted cost-conscious consumers with well priced data plans.
Compare all phones available on Three
O2 stands out its Rewards customer incentive scheme that entitles subscribers to discounts on high-street purchases, and Priority, which provides priority ticket booking at O2 venues.
It's also known for good customer service and comprehensive coverage.
Compare all phones available on O2.
Vodafone is one of the oldest UK mobile phone networks and the second largest mobile network operator in the world in terms of number of global subscribers.
In the UK, it's known for its premium range of handsets and contract sweeteners, such as free use of Spotify and Sky Sports Mobile, and the Freebees pay as you go free-minutes and data scheme.
Compare all phones available on Vodafone
EE, which encompasses the now retired T-Mobile and Orange brands, boasts the UK's widest 4G coverage and fastest connection speeds.
EE customers also get free movie rentals through the EE Film Store.
Compare all phones available on EE