I'm looking for panel data at the county, city, or state (worst case) level for the United States showing the number of smartphone users or the size of the smartphone market in these locations. This could be expressed in either absolute counts or as percentages. Ideally, I would want historical data from 2017 or 2016 to 2008, but anything since 2010 would also work.
Alternatively, I am also looking web device usage data at comparable levels. That is, a look at what type of devices were used to access the web. This, too, would have to cover the same time periods.
I am also open to commercial data sources, but would prefer open data. The closest answer I have found so far was this: Cellphone vs Smartphone usage? but it still doesn't fully answer the question.