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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 urging you to switch your fiber-optic line. Rather than a specific agency name, they call themselves "Docomo Service Desk" or "NTT". They target users who previously had contracts with NURO Hikari and the like. Sales talk such a (machine translation)
A checklist of contacts and services to update before changing your phone number, and ways to reduce nuisance calls without changing it.