Go to Settings > Account
Click “Unlock” under Google Voice number.
There may be a charge. Go to Google Pay to finish the transaction.
Go back to your Google Voice number porting and check the status to see that it says unlocked or the button changes to the lock option.
Once it shows your number as unlocked you can fill out your porting form from Voxtelesys:
Account number (phone number with no dashes)
Port Out Pin (used to check your voicemails, if you do not have one leave blank)
Look for the Google Voice email that shows your number has been successfully ported.