Number overview
0120-924-580 is a number with user reports describing calls in the name of a "Fiber-Line Support Center" soliciting internet-line switches (as of 2026-08-03).
Reported tactics
- Reports of callers naming themselves a "Fiber-Line Support Center" and pitching a line switch
- Reports of sales talk such as "your bill will drop"
We could not find any desk under the name "Fiber-Line Support Center" on the official sites of NTT or major ISPs (as of 2026-08-03). Don't engage with solicitations that stay vague about who is calling.
How to handle this call
Don't pick up
Be cautious even with 0120 numbers when the number is unknown. Free Dial doesn't automatically mean safe.
If you do answer
Don't share details of your current contract (ISP name, line type, etc.). Say "I don't need it" and hang up.
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 as "Fiber-line Support Center"
- Number-lookup articles via Hatena Bookmark: reports of line-contract sales calls in the name of a "fiber-line support center" (March 2026)
- Telnavi: user reports classifying it as internet/Wi-Fi line sales (1.0 rating)
Where to report or get help
- Ministry of Internal Affairs and Communications - Telecommunications Consumer Consultation Center: 03-5253-5900
- Consumer Hotline: 188