Alarm clocks in every bedroom and a kitchen clock, plus a couple which are purely ornamental and are not wound up so do not tell the time and my watch.
When I am at my computer, that is what I use, but to be forever running to my computer and waiting for it to wake-up in order to find out the time would be time-wasting and inefficient. A quick glance at my wrist watch or a quick glance at the kitchen clock as I pass through tells me the time within seconds.
As for mobile phones..... I live in a notspot. In the house a mobile phone is as much use as a chocolate teapot. So it lives in the car, which is where I need it for when I leave the house and visit one of those magic areas with mobile phone reception. Even if I could use my phone in doors I still wouldn't use it to tell the time. Once again, unless you hang it around your neck like glasses, you would have to go to where you keep it and probably again, wake the phone every time you wanted the time.
I don't have a good sense of time and I am out and about a lot so I am checking the time several times every hour. A watch, analogue or digital is a far quicker and more efficient way of doing it than mobile phones, computers or tablets.