Safe number

0120-384-021 phone number information

Updated: 2026-08-03

Basic Information

Number Type: Free Dial (0120)
Carrier: KDDI Corporation

Number overview

0120-384-021 is listed by KDDI (au) in its official FAQ of au caller numbers. We confirmed the listing on the official page (as of 2026-08-03). Directory reports describe calls about au Denki and other campaign notices.

What the calls are

Notices about au services and campaigns
Reports mention au Denki related notices

If you receive a call

If you have an au contract, the call may be about a service you use. If you do not want solicitations, it is fine to say so. If anything looks off, verify through the My au app or the official website.

Where to report or get help

Consumer Hotline: 188
Police consultation line: #9110
Ministry of Internal Affairs and Communications - Telecommunications Consumer Consultation Center: 03-5253-5900

Sources (official)

au (KDDI) official FAQ listing 0120-384-021 among au caller numbersVerified on 2026-08-03

Frequently Asked Questions

What kind of call is 0120-384-021?

It is a caller number listed in au (KDDI)'s official FAQ (confirmed as of 2026-08-03). User reports describe au Denki campaign notices.

View and post reviews for this number

Go to reviews for 0120-384-021

Reported numbers in the same number range

How to Refuse Sales and Solicitation Calls

How to refuse sales and solicitation calls, backed by Japanese law. Covers your right to refuse under the Act on Specified Commercial Transactions, ready-to-use refusal scripts, and the cooling-off process.

Where and How to Report Nuisance Calls in Japan

A comprehensive guide to reporting nuisance calls to the police, consumer affairs centers, the Ministry of Internal Affairs and Communications, and mobile carriers. Learn the best reporting channel for each situation and what to prepare.

Do You Know the Difference Between 0120 and 0800? Behind the Scenes of Toll-Free Numbers

Both are free-to-call numbers, but 0120 and 0800 have surprising differences. Learn about their history, why companies choose one over the other, and what consumers should know.

Benefits and ROI of Implementing a Toll-Free Number

Learn how implementing a toll-free (0120) number boosts inquiries and customer satisfaction, with a practical guide to calculating ROI.

0800-777-0194

About the toll-free number 0800-777-0194. Listed in the KDDI (au) official FAQ of caller numbers. Several directories also carry reports describing it as sales calls.

0120-911-314

One of the caller numbers KDDI (au) uses to contact customers. Listed in au's official FAQ enumerating KDDI's outbound numbers.

03-6705-0713

About the Tokyo landline number 03-6705-0713. Listed in the official Mitsubishi UFJ NICOS FAQ as a caller number for payment-related notices (including automated voice calls).

0120-353-134

About the toll-free number 0120-353-134. Listed on Idemitsu Credit's official site as its Life Consult Desk for cardholders. Some reports describe insurance-related sales calls.