If someone had asked you 20 years ago what your most valued appliance was, I highly doubt you would have said “mobile phone”. In fact, had you been told that you would be completely dependent on something that at most is 18 square inches and weighs less than a half a pound, you would have laughed.
Yet here we are, its 2019 and according to the Pew Research Center, 95% of Americans own a cellphone of some kind, and 77% own a smartphone.