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Number Range Info
0800 is the toll-free (Free Call) number range. Like 0120, it is a call where the receiver pays, used by corporations as an alternative when 0120 is unavailable.
Sales calls from a telecom line company calling itself "Hikari Support" or similar. Proposals that switching your fiber-optic line will lower your bill, and sales under the pretext that "your modem needs to be replaced" (machine translation)
A checklist of contacts and services to update before changing your phone number, and ways to reduce nuisance calls without changing it.