The phone gives us a lot but it takes away

Barry’s impact on the assembled Goddard employees was immediate; from the moment she arrived, she insisted on abandoning all electronic devices. “They were really flipped out about it,” says Barry. “The phone gives us a lot but it takes away three key elements of discovery: loneliness, uncertainty and boredom. Those have always been where creative ideas come from.
Lynda Barry at NASA: Drawing to Infinity and Beyond. Via RUK.

Thinking, particular creative thought requires disengagement. My best work, or really any work that requires thought at all, is generally done without a mobile phone or any screen. Later, after pen has hit paper, these ideas are ready to be solidified with some kind of device with a screen.