Create a Twilio subaccount:
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Navigate to the Account dropdown and choose Subaccounts.
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Select Create Subaccount.
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Provide Friendly Name for new subaccount.
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Select Create subaccount.
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Select the newly created subaccount.
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On the left side of the screen, navigate to # Phone Number>Manage>Verified Caller IDs.
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An existing non-Twilio phone number, like the number to a wireless phone or a landline in your home or office, must be validated on your Twilio account, via a One-time-passcode (OTP), before it can be used for specific Twilio account services.
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On the left side of the screen, navigate to # Phone Number>Manage>Buy a number.
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Select Buy on the preferred number.
