Please see What is the process for Porting a Phone Number to Plivo for complete details on the entire porting process.
Plivo requires the following documents in order to initiate the porting request:
Signed Letter of Authorization (LOA). The LOA Template can be found here: https://www.plivo.com/faq/number-porting/what-is-number-porting/.
Recent Invoice from the previous Service Provider which proves the ownership of the number or The Customer Service Record for the Phone Number.
The Plivo Account email that you would like the phone numbers to be ported to.
If this is a Wireless Port, then please include the wireless account PIN/Passcode.
For VoIP numbers including Google Voice, Skype, etc., you may not be able to obtain a CSR or invoice as proof of ownership, therefore please provide a screenshot of the account page with your name and the phone numbers you wish to port in question visible along with your LOA.