People in the new generation who use computers to do real work don't use phones because you can't do very much in the way of real work on a phone. Developers also don't use phones because you can't develop (much) on a phone. They are pretty much pure consumption devices.
What's happened is that the phone has replaced the PC for casual consumer-level computer use, except maybe high-end gaming.
What's happened is that the phone has replaced the PC for casual consumer-level computer use, except maybe high-end gaming.