David has replaced his computer with a smartphone. He mentions using his smartphone for various activities, such as listening to music, playing games, and helping his mum with chores.
Erin, on the other hand, has not replaced her computer with a smartphone. She emphasizes the limitations of a smartphone, citing the small screen size and the need for a computer's processing power, especially when editing photos and playing video games.
Kamala raises a broader question about whether smartphones have replaced computers in general, sparked by Steve Jobs' comparison of traditional computers to lorries and tablets to cars.