The sample is "1,502 U.S. adults from Jan. 25 to Feb. 8, 2021, by cellphone and landline phone" if this is the same survey as linked in this article

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"?