How to stop my calls or number being label as spam with carriers?

iPlum provides you a dedicated business line.

For outgoing calls, iPlum sends your iPlum name & number as Caller-ID in every call by default.  

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If your outbound calls are getting mischaracterized by some carriers and marked as spam, you can use this form to update your caller-id information.

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Note: Contact Name, Phone, Company, Email, Calling Company Name, Address, URL is your information on this form so that the carriers recognize you as the rightful owner of this number.
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https://www.freecallerregistry.com/fcr/#submitform

Additional helpful links:

How to stop receiving spam calls or text to your iPlum number?