olemus
firma, mis annab sideteenuseid
= a telecommunications service provider

ülevaateid
https://www.lawinsider.com/dictionary/telecommunications-company
https://en.wikipedia.org/wiki/Telephone_company
https://en.wikipedia.org/wiki/Category:Telecommunications_companies
https://en.wikipedia.org/wiki/List_of_telephone_operating_companies

vt ka
- sideettevõte (2)
- sidefirma (2)