About

Site Overview

Purpose

Denwa is a phone number search service for anyone who feels uneasy about calls from unknown numbers. By checking caller information and reviews from other users, we help you decide whether to return a call.

Aiming to reduce the harm caused by nuisance calls and phone scams, we provide not only phone number search functionality but also knowledge articles on scam tactics and countermeasures, a glossary explaining phone number systems, and FAQ organized by number type.

Services

• Phone Number Search: Enter a phone number to check reviews and spam scores
• Review Posting: Post reviews about phone numbers you have received calls from, including caller type and call content
• Area Codes: Browse area codes and their corresponding regions across Japan
• Knowledge Base: Articles covering phone scam tactics, nuisance call countermeasures, and phone number systems
• Glossary: Clear explanations of phone-related terminology
• Number Type FAQ: Answers to common questions organized by number type - landlines, mobile phones, IP phones, and more

Operating Policy

• We respect user privacy and collect only the minimum necessary information. See our Privacy Policy for details
• Reviews that identify or defame individuals are prohibited. See our Terms of Service for details
• We strive for accuracy, but reviews are based on user opinions and we do not guarantee their accuracy
• For service improvements or bug reports, please use our Contact Form

Disclaimer

This site is provided free of charge, and we do not guarantee service continuity, stability, or accuracy. The operator cannot be held responsible for the results of judgments or actions taken based on information from this site. See our Terms of Service for details.