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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 soliciting you to switch your fiber-optic line or internet connection service. They often don't give a specific company name or use vague names. They pitch switching to So-net Hikari or NURO Hikari, with sales talk like "your co (machine translation)
A checklist of contacts and services to update before changing your phone number, and ways to reduce nuisance calls without changing it.