Number overview
For 0120-983-429, many user reports, mainly on jpnumber, describe calls claiming a statutory gas-appliance inspection of the area that unilaterally set a visit date, with the caller's attitude turning hostile or the line being cut when refused (as of 2026-08-03). Reports include calls to all-electric homes with no gas contract, and number-lookup articles describe free-inspection sales in the name of a gas-equipment vendor.
Statutory gas inspections in Japan are conducted by your gas supplier or its notified contractor with advance notice, not by cold calls fixing a visit date. Inspection-pretext visits can lead into pressure sales of equipment or contracts.
Reported behavior
- Setting visit dates under the claim of a statutory or free gas inspection
- Admitting it was just a sales call when questioned; hostile hang-ups when refused
- Calls to homes without any gas contract
How to handle this call
Do not accept a visit
Never accept a visit based on a call alone; ask your gas supplier's official desk whether a genuine inspection is scheduled.
Be careful even at the door
For inspection-pretext visits, sign nothing on the spot and consult the Consumer Hotline (188) if anything is off.
Sources of the reports
The descriptions on this page are based on user reports posted to third-party phone-number directories (checked as of 2026-08-03). This site has not independently verified the caller, and nothing here identifies the caller definitively. The reporting sources we checked are:
- jpnumber: many reviews describing statutory-inspection claims (April and May 2026)
- Number-lookup articles via Hatena Bookmark: reports of free-inspection sales in a gas vendor's name
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