Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
phone-in is a noun meaning "a program in which the audience participates by telephone". It carries one recorded sense.
a program in which the audience participates by telephone
Definitions, synonyms and semantic relations for phone-in come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.