I joined on a new number and but did not port but from what I have read about porting here and on Reddit here is what I know, to answer question 1, No you can still use your old phone with your existing line at Verizon, it will not cancel until port is finished. Just make sure to keep that account or line active at Verizon.
Question 2. Yes, once the port finished it will cancel your number at Verizon. You will actually active the new phone and Visible will assign a temporary number before you can do or finish the port process. From what I read about porting from a multiline account it should only cancel your number. If your number is the main account or primary number of the account you might want to make one of the other numbers the primary number of the account.
Again this information is only what I have read here and on Visible's Reddit page. If you need help maybe this link will help you out.
https://www.visible.com/help/how-do-i-transfer-port-my-number-to-visible
Or go to www.visible.com and click on the help page and find other or more information on porting.
Also, this forum is not visited by Visible, it is customer based forum and not visited by many people so maybe if someone else that reads this that ported from Verizon can give step by step instructions.
