telecommunications company; telco
Refers to a company that provides telephone or telecommunications services. The term is straightforward and widely understood.
I switched to a new telecommunications company.
Compare the rate plans of telephone companies.
local telephone company
common carrier; telecommunications carrier
long-distance telephone company
regional Bell operating company; RBOC
Compound of 電話 (telephone) + 会社 (company). A straightforward modern term with no obscure historical derivation.