Rory Cellan-Jones visits San Francisco to find out how Silicon Valley is preparing for the new US President. He speaks to renowned tech journalist Kara Swisher from Recode, serial entrepreneur Michael Birch, and Parmy Olson from Forbes magazine. Plus, 10 years after Apple introduced the iPhone we assess how smartphones have changed business and ask whether the devices will remain central to how we access the net. And, our reporter Chris Foxx tries out the new Nintendo Switch console. With Chris Baraniuk from the BBC Online tech desk, and special guest Paul Lee,Technology, Media, and Telecoms Head of Research at Deloitte. (Image: San Francisco cable car, Credit: Justin Sullivan/ Getty Images).