The document discusses who pays for mobile devices used in schools, outlining three main models: the school pays fully; the school provides a subsidy with parents contributing; or devices are provided by parents (BYOD/BYOT). Traditionally, schools provided devices but allowed home devices to be used at school. More recently, 1:1 schemes involve schools or subsidies, while BYOD/BYOT means devices are parent-provided but used at school. The document gives examples of these different payment models for mobile devices in schools.