Looking up...
A device used for telecommunication, typically consisting of a microphone, speaker, and dialing mechanism to make and receive calls.
電話機を使って友達に連絡した
I contacted my friend using the telephone.
In modern usage, '電話' alone is often sufficient to refer to a telephone, but '電話機' emphasizes the physical device.
In everyday Japanese, '電話' is more commonly used than '電話機'.
Composed of '電話' (telephone) and '機' (machine/device).
'電話機' is more formal and emphasizes the physical device, while '電話' is more commonly used in everyday conversation.