I think less than five people know my real phone number. I have been using the same “Google Voice” number to forward to my phone since the service was called Grand Central (pre-Google buy out). It filters out calls and texts from disposable VOIP numbers by default. They go straight to SPAM. You can port your main number to Google Voice and forward it back to your current phone. You can also text and call from your new phone through Google Voice so the people on the other line still see your original number and only you know it has been ported.