4G was first introduced to the UK in 2012, with EE rolling out its 4G services to 11 major cities including London, Manchester, Bristol, Birmingham, Cardiff, Edinburgh, Leeds, Liverpool, Sheffield, Glasgow and Southampton.
At the time of its launch, EE said that its 4G network would offer speeds up to 12Mbps, five times faster than the previous generation.
However, 4G has come in for criticism as UK residents complain about the lack of 4G coverage across the UK.
According to the mobile data platform Ogury, UK residents can only access 4G networks 53 percent of the time, making the UK the worst place for 4G coverage in Europe, falling behind both Spain and Italy.
But for those UK residents that do use 4G, this standard offers fast mobile web access, gaming services, high-definition videos and TV support and high-quality video conferencing.