New functionality of iOS 9 separate Wi-Fi will automatically switch to using the Internet telephone

Apple has introduced pilot iOS 9 gradually put to official useiOS and 9 pilot phase, there was an update to add new functionality.

Added functionality when the update in this new Wi-Fi Assist function, which is a new function to facilitate interruptionswhen using the Internet via Wi-Fi. This function is the role change from the use of Wi-Fi to mobile internet users automatically when a Wi-Fi isolated or weak Wi-Fi service.