number withheld; anonymous call
Refers to phone calls where the caller's number is not displayed. Often used in contexts like 非通知設定 (caller ID blocking) or 非通知着信 (incoming call from a withheld number).
I try not to answer calls from withheld numbers.
I make the call after turning on caller ID blocking.
番号非通知 is a more explicit term for 'number withheld', often used in formal contexts or settings menus.
Compound of 非 (hi, 'non-') and 通知 (tsūchi, 'notification'), literally 'non-notification'. Used specifically for phone calls where the caller's number is not disclosed.