And how does that logic work in a situation where land lines are becoming somewhat obsolete or atleast not a mandatory option? Plus, I carry a mobile, but does

And how does that logic work in a situation where land lines are becoming somewhat obsolete or atleast not a mandatory option? Plus, I carry a mobile, but does that mean I should only receive calls when I am home or near a land line? Sounds archaic at best and telecom company plan to get the most money they can at worst. The US system has never made sense to me.