A public utility that provides telephone service(noun)
WordNet. Princeton University. 2010.
Use "phone company" in a sentence
"Its a cell phone company that figures out how to turn low-income Africans into a market (e.g., Safaricom in Kenya); or a government that amends an outdated law to free businesses and farmers from costly middlemen (e.g., the government of Madhya Pradesh, in the case of ITCs e-Choupal initiative)."
"Duffy’s status might just get her a major once-in-a-lifetime favor, one-on-one with a phone company manager."