Increasingly this isn't the case. I'm Amish and people get hostile when I don't have a phone much less a smartphone. Flights, financial transactions of all types, a lot of travel requires it now for some aspect. Those services do not exist for us anymore. Most recently the nearby airport stopped being able to use printed flight passes because the new scanners were built to interface with the smartphone app for the airline, which uses a navy blue background on the boarding passes. Having a printed pass relegates you to a secondary delay to account for that regardless of boarding class.
Does someone paying for identical service as a person owning a phone still deserve to board with others despite the airline's issue with their hardware?