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Registering a business tells the US carriers who owns its numbers, so its calls are labelled as spam less often. What a registration does, what it needs and what it cannot promise are in Caller ID registration. Both operations take the business’s locationId. Read the summary first: it says which numbers are ready, lists every detail a registration takes in fields, and gives the termsVersion a registration echoes. Both use the phone number scopes your key already has, so no new key is needed. phone_numbers:write also covers reading. See Authentication.