How to Say "Phone Numbers" in Japanese

電話番号

denwa bangō[dẽ̞ɰ̃β̞a̠ bã̠ŋɡo̞ː]

The Japanese phrase for "phone numbers" is 電話番号 (denwa bangō).

電話番号 is used to refer to the sequences of digits used to call a person or a business on a telephone.

What does it mean word for word?

The word is a compound of 電話 (denwa), meaning "telephone" and 番号 (bangō), meaning "number".

Japanese nouns do not change form to indicate plurality, so 電話番号 can mean both "phone number" and "phone numbers" depending on the context.

denwa bangō

The number 4 is often avoided in phone numbers or room numbers because 四 (shi) is a homophone for 'death'.
While English speakers say 'zero' for the digit 0 in a 電話番号, Japanese speakers frequently use ゼロ (zero) or マル (maru), which means 'circle'.
The word 電話 (denwa) is a compound of 'electricity' and 'speech'. It literally translates to 'electric speech' to describe the telephone.

電話番号交換しようよ。
Let's exchange phone numbers.
This sentence is useful for showing how to suggest exchanging 電話番号.
Tatoeba #12324530 by small_snow, translation #10645124 by sundown
新しい電話番号を教えてください。
Atarashii denwa bangou o oshiete kudasai.
Please tell me your new phone number.
電話番号を間違えました。
Denwa bangou o machigaemashita.
I got the phone number wrong.

Misaki and Hiroto are filling out a form together.

美咲 Misaki

大翔さん、電話番号はどこに書きますか？
Hiroto-san, denwa bangō wa doko ni kakimasu ka?
Hiroto, where do I write the phone number?
大翔 Hiroto

その下の欄に書いてください。
Sono shita no ran ni kaite kudasai.
Please write it in the column below.
美咲 Misaki

わかりました。これでいいですか？
Wakarimashita. Kore de ii desu ka?
I understand. Is this okay?
大翔 Hiroto

はい、大丈夫です。
Hai, daijōbu desu.
Yes, that is fine.

Sources

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