Number overview
0800-300-0336 is a toll-free number (the 0800 prefix). It is reported as a fiber-line sales call.
Reported behavior
- Sales calls promoting a fiber-line switch have been reported
- Some calls keep the company name vague throughout the pitch
The Ministry of Internal Affairs and Communications has communicated that solicitations for telecom services must clearly state the company name.
How to handle this call
Ask "Which company are you calling from?" and confirm the company name; if you don't need the service, decline.
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: registered with a warning label as a fiber-line sales caller
- Number-lookup articles via Hatena Bookmark: reports of line-contract sales such as au Hikari
Where to report or get help
- Consumer Hotline: 188
- Ministry of Internal Affairs and Communications - Telecommunications Consumer Consultation Center: 03-5253-5900