iOS 7.1 is the biggest update since Apple launched iOS 7 along with the iPhone 5S and 5C in 2013. One change we weren't expecting was a brand new voice for Siri - Apple's personal assistant that can search the web for you, send emails and text messages, play songs, launch apps and even tell the odd joke.

The old Siri voice was rather robotic and always sounded angry with you. The new voice is much softer and friendlier - watch the video to hear the enormous difference between the two.

See also: what's new in iOS 7.1 and get to know Siri in iOS 7