Landline random-digit-dialing survey coverage problems due to cell phone– only households have led to a growing number of cellular telephone surveys being conducted to supplement traditional landline random-digit-dialing telephone surveys. We will discuss cell phone sampling frames; landline to cell ported numbers; trade-offs of screening for cell phone–only households versus using a dual-frame sample design that includes households with landlne and cellular telephone service; the two alternative sampling models that have received the most attention—a household level sampling model versus a person level sampling model; and weighting techniques, including how the National Health Interview Survey, Current Population Survey, American Community Survey, and others can be used to develop estimates of the size of the cell phone–only population.