Usage Note
Téléphonique is the invariable adjective meaning 'relating to the telephone'; it does not change for gender. Common collocations include une cabine téléphonique (phone box), un réseau téléphonique (telephone network), and une conversation téléphonique (phone conversation). It is purely formal/written; in speech one often just says par téléphone.
Examples
"Il a reçu un appel téléphonique urgent."
Natural Translation
He received an urgent phone call.

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