The Code of Practice for Determining Employment or Self-employment Status of Individuals (pdf) contains criteria which can be used to clarify whether a person is employed or self-employed. In most cases, it is clear whether a person is an employee or not.
The 708 area code belongs to the state of Illinois (IL) and some of the locations covered are Cicero, Oak Park and more:
Area code 707 was created from a split of area code 415. Counties in California within area code 707 include: Del Norte County, Humboldt County, Lake County, Marin County, Mendocino County, Napa County, Solano County, Sonoma County, and Trinity County.