Cancel Koodoo plan. We an unlocked Iphone.
You will have to get in touch with Koodo through customer service or Koodo’s Facebook. Have you considered Seasonal Hold as well? I believe it is $15/month up to 6 months and it will retain your your phone number. If you choose to go this route you will have to get in touch with Koodo the same way as cancelling.
Another option of you care to keep your number is to port to a VoIP service as there's usually a one time porting fee and isuch cheaper than 15 x 5 =75 dollars. Then you can still use the phone number via WiFi or data to send / receive Canadian calls. Then you avoid having to speak to Koodo if you port out for the 5 months.