Hi Just a quick note to anyone on here in the UK who's on giffgaff. As of today, they are now an official Apple carrier. To receive the carrier update, just go into Settings > General > About and wait for the popup. Takes all of 15 seconds to install. This means that it now displays 'giffgaff' in the menu bar, Personal Hotspot works (whoopie!), carrier settings are applied automatically after updates, and the Voicemail button now works. Visual Voicemail still isn't available unfortunately. Hope this helps anyone.