https://www.pewresearch.org/fact-tank/2022/01/13/share-of-th...
it links to this methodology document in the "How we did this" dropdown:
https://www.pewresearch.org/wp-content/uploads/2022/01/Tech-...
I agree with your point. Do they account for the number of Americans that don't have a phone at all somehow or should the real headline be "97% of American adults that can be called by cellphone or landline own a cellphone or smartphone"?