(Telecompaper) Mobile operator 3 UK has launched the UK's first VoLTE service and is calling it '4G Super Voice'. The VoLTE service is carried over 800 MHz spectrum, whose shorter wavelength is better at going through walls. It also carries further to reach remote rural areas. CTO Bryn Jones told the Telegraph, "Indoor coverage across the industry is always the hardest problem to solve, so all networks, whether it's 2G, 3G or 4G will always have coverage blackspots." The operator said that 4G Super Voice already covers half of the UK population for indoor coverage and over three quarters of the cities of London, Birmingham, Exeter and Edinburgh. The rollout is continuing in Manchester, Liverpool, Bristol and Cardiff. Handsets supporting 800 MHz include the Samsung Galaxy 5, LG G4, iPhone 6s and 6s Plus. Customers must update their software to the latest version to use 4G Super Voice. UK operators EE and O2 are trialling VoLTE.