How do mobile phones affect city planning?
Those things affect urban planning a lot.
But the thing is Street signs and door bells don't take up any space. There's no real benefit in removing them anyway.
Private cars are a big issue but the problem is people commuting from outside the city and shared car schemes are too expensive for that.
Its definitely, imo, to the point where it is becoming a responsibility of societies to provide its citizens access to these technologies because of their utility. That means subsidized / free phones and service, imo. Everyone really should have a baseline of digital access as a fundamental right, hopefully this decade. The COVID relief free cell service in the US I think has been an eye opener for me.