Does anyone know which UK networks will support HD voice/wideband audio on the iPhone 5? At the iPhone 5 keynote Apple said 20 networks would support it at launch. I can't find any information on which UK networks will support it but it seems the only ones which already have HD voice on other phones are Orange and Three. I've seen several articles mentioning that none of the US mobile networks will support it on the iPhone 5 - the networks with HD voice there seem to use a different standard. I think that in theory at least the UK networks should be able to support it though? There are a few posts on Three forums suggesting that even some phones which support HD voice require a firmware update to make them compatible with Three's implementation.