Under normal circumstances, customers porting toll-free phone numbers should not experience any downtime during the porting process. This is because when the toll-free phone number is released by your carrier to Plivo, it is standard practice for your carrier carrier to continue service for the ported phone number until the Plivo finishes the porting process and all the re-routing is complete. 

Our support team handling your porting request will provide details outlining the entire porting process and what to expect at each step.