How many phone numbers to have?

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Hello BP Community - I have been doing some research and keep getting too broad of answers. What is a decent amount of phone numbers to have and for what use. I know this also varies depending on the niche you are in. For instance - we current have: Main phone number, marketing phone number This was ok when we started, but not we're implementing multiple campaigns and we want to be able to track where our leads are coming from. You can always ask the individual but when you have direct mail, the more variations you send, the harder it is to track.