Apple says that 20 LTE bands will be used by the iPhone 6 models, which is the most ever for the smartphone. 200 LTE carriers will support the iPhone 6. It will also support voice over LTE . Carriers like Verizon, AT&T and T-Mobile in the U will support that feature
As far as WiFi support, the iPhone 6 models will support 802.11ac and will also support Wi-Fi calling, with T-Mobile in the US and EE in the UK adding that support for the phone.
Stay tuned as we will have more from the iPhone press event in Cupertino.