Yes just go to a Koodo kiosk to make the switch while your Rogers account is still active and tell them you'd like to port your number from Rogers to Koodo. Just keep in mind that your Rogers account must be active or you won't be able to port.
What do you mean by 'active'. Number is active but there is no minutes at this point on it. So at this moment no one can reach me. Do I have to buy minutes in order to have it 'active' to be able to move this number to another service.