Evidently in a call center they have to use a phone - to place phone calls. But where do they get the info to call people (and store answers), or if answering, how do they operate on customers' requests? On a tablet without a keyboard?
If I go to a bank/insurance they use computers. If I go to the post office they use computers. My accountant do use computers. The notary a few days ago asked his secretary to correct a document and print it - from a computer. If I go to a city/regional/state office they use computers. The hospital reception uses computers. When I brought my car in for maintenance, it was checked-in using a computer (BMW... they read data from the car "key", though. Ford does use rugged tablets also, though).
All are non-technical workplaces. Where are all those places that only uses tablets and phones?