5G stands for 5th generation. It is the 5th generation of wireless technology which makes up the infrastructure of networks which provide our mobile phones with signal and data connectivity. Being more advanced, it provides faster speeds than its predecessors 4G and 3G, but is less widely available in towns and cities across the UK at the moment. If your phone is 5G-ready and your mobile deal includes it, you automatically join a 5G network once you enter an area which has coverage.