They're probably not defined as basics based on how frequently people use them compared to apps, but, phone and SMS are still the lowest common denominator.

I've been dealing with the police recently after a minor burglary. That involved both making and receiving phone calls.

My dentist has an automated system that texts to confirm appointments.

Despite its downsides, SMS-based 2FA is ubiquitous and you don't always have ability to opt into something more secure.

I'd expect most people elect to use apps for communication when they've got an option, but there are tons of scenarios in modern life where you really don't have the option.