phone service vs telephone service

phone service and telephone service both are nouns.

Word	Noun	Adjective	Verb	Adverb
phone service	Yes	No	No	No
telephone service	Yes	No	No	No

As nouns, phone service and telephone service are synonyms defined as:

phone service and telephone service: a public utility that provides telephone service

Other synonyms of phone service include phone company, telco, telephone company.

phone service (noun)	telephone service (noun)
a public utility that provides telephone service	a public utility that provides telephone service