The Apple iPhone 4S launched in October 2011 with its voice recognition innovation feature Siri. Siri allows users to operate the device with voice commands to create text messages, emails, notes, reminders, searches and make calls.
UK billions aren't always the same as US billions. When billions are used in the UK, they often mean what the Americans would call trillions. It's important to get clarification on which billion they're actually using in figures because they still use both!