Researchers have uncovered a secret in iOS 7: under the hood Siri is using a completely new method of accessing the Internet that uses both Wi-Fi and 4G at the same time. Officially called Multi-Path TCP the new technique enables an iPhone or iPad with Wi-Fi and 3G/4G to use both Wi-Fi and Cellular data at the same time, and switch seamlessly between the two. For a device that is permanently connected to the Internet via Wi-Fi and 3G/4G the new technology could have profound effects on performance. To start with its been quietly rolled out to just Siri, but we expect Apple to widen access to further iOS apps and the operating system as a whole. See: New Siri features in iOS 7 and How to use Siri on the iPhone
