This inventory is designed to measure the use of the smartphone as it relates to learning. Details of the measure development can be found in the 2020 publication cited below.
Hartley, K., Bendixen, L. D., Olafson, L., Gianoutsos, D., & Shreve, E. (2020). Development of the smartphone and learning inventory: Measuring self-regulated use. Education and Information Technologies. https://doi.org/10.1007/s10639-020-10179-3