IPA: /ˌtɛləˈfɪnɪk/
KK: /tɛləˈfɪnɪk/
Related to or involving telephones.
We had a telephonic conversation to discuss the project details.
Telephonic → It is formed from "tele-" (from Greek "tēle", meaning far off or at a distance) and "phonic" (from Greek "phōnē", meaning voice or sound). The word "telephonic" refers to something related to sound or voice transmitted over a distance, typically through a telephone.
Think of 'far off' ('tele-') and 'voice' ('phonic') to remember that 'telephonic' relates to voice communication over long distances.