Just because we have phones and computers doesn't mean we should stop everything we're doing just to check up on them constantly. Society breeds lemmings.
There's a fine line betwixt convenience and plague, utility and plight, nurturing and smothering.
No one owes you anything just as you owe no oneanything.
Life is deeper than the tools we craft as conveniences; If you can't get ahold of someone when you really want to, perhaps you oughtta go do something for yourself:
Think. Read. Breathe. Create art. Drink a glass of water. Drink a glass of wine. Sleep. Meditate. Dance. Cook. Laugh. Think.
You just may be amazed what you can learn and accomplish when you turn your focus inward without explicit regard for time or space or your computer or phone.