Japanese phrase
___の件でお電話しました。 ___ no ken de o den wa shi ma shi ta
Meaning
I am calling about ___.
When to use it
States the subject of a phone call. It is a polite and formal way to introduce the reason for calling, especially when speaking with a business or someone unfamiliar.
Example dialogue
予約の件でお電話しました。 yo yaku no ken de o den wa shi ma shi ta
I am calling about a reservation.
はい、担当者におつなぎします。 ha i tan tō sha ni o tsu na gi shi ma su
Certainly, I will connect you with the person in charge.