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Number Range Info
050 is the IP phone number range. It is assigned to phone services that use the internet, often used by call centers and businesses seeking lower communication costs.
I got a call from 050-3113-7798, and since I couldn't make it back in time I called again, but no one answered. When I asked the person in charge, they said they had called from a mobile phone and that the 050 number was the company's numbe (machine translation)
A checklist of contacts and services to update before changing your phone number, and ways to reduce nuisance calls without changing it.