I have seen quite a few people around me who appear to be sleeping rough and have older model smart phones, that I would speculate are being used wifi-only (based on mostly seeing them in places with municipal wifi). A second-hand several year old model without cell service can be had for nearly nothing and strikes me as a tremendously useful thing to have in such a situation.
I have seen exactly zero instances of someone who appeared to be sleeping rough walking across the street staring at their phone, though.
