EE has launched the UK's first next-generation 5G mobile network, with a concert by rapper Stormzy live-streamed from a boat on the River Thames.
5G mobile networks offer faster downloads, but customers will need a new handset to take advantage.
At first, the service will only be available in limited areas of Belfast, Birmingham, Cardiff, Edinburgh, London and Manchester.
Rival Vodafone plans to switch on its 5G service in the coming weeks.
EE's lowest-priced deal is £54 a month plus a one-off £170 fee for a compatible handset. But this only includes 10GB of data a month, which can be used up quickly if you download lots of movies or games.