Smartphone ownership is highly correlated with household income. Respondents from the highest income cohort (those with an annual household income of $150,000 or more) are around three and a half times as likely as those in the lowest income group (with an annual household income of $10,000 or less) to own a smartphone: roughly three quarters of high-income earners do so, compared with one in five low-income earners. SOURCE: Pew Internet Research
A household income of $75,000 is the approximate point at which Americans are more likely to own a smartphone than not—more than half of Americans above this income level are smartphone owners, and cell phone ownership in general is near-ubiquitous (95% or more) past this point in the income distribution.
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Thank you again to the Pew Internet for all this amazing research.