Hi Damian, great question! Yes, once porting to NumberBarn is 100% complete, you can definitely cancel your service with your provider. Just make sure there aren't any additional telephone numbers or services on that plan that are important to you. Also, just keep in mind that if you have a contract coming up soon to port well in advance of that contract expiration. Porting is usually pretty quick but it's best to allow 3-10 business days just to be safe. Let me know if you have other questions. You can reach our support team and find other solutions at https://help.numberbarn.com/hc/en-us.