Three's hellbent on continually improving network reliability and coverage, and as part of that, the carrier has today announced it's gearing up to add Voice over LTE (VoLTE) support to its network this autumn. The provider is currently on track to switch its VoLTE service on in September, facilitated by tagging additional 800MHz spectrum onto its existing 1800MHz network. This new slice of bandwidth is expected to significantly improve coverage in problem areas, particularly inside buildings, where 800MHz airwaves can penetrate more easily than other frequencies. Three expects roughly 1 million of its 8.5 million customers to be reaping the benefits of VoLTE by the end of the year, taking calls in places 2G and 3G signals can't reach. The only catch is you're going to need a VoLTE-compatible handset, such as the iPhone 6 or Galaxy S6. Any relatively new handset should do, though.