Our Site: http://www.3datasim.co.uk/three-12gb-data-sim Three 1GB Data Sim planned to launch 4G in the second quarter of 2013, however it delayed the rollout until Q4, saying that it wanted to analyse the performance of other networks' 4G coverage first. The network provides LTE and DC-HSDPA service as a standard feature to all its subscribers using "Ultrafast" to describe both technologies, making it the cheapest price for 4G and the only unlimited 4G in the UK. On 23 April 2015, Three announced that VoLTE would be rolled out along with 800 MHz spectrum from September.