Sign into the Koodo self serve website. Make sure you have added the free “International Voice Roaming" and / or the free “International Data Roaming” add on. Also make sure Pay-per-use International Long Distance is active. Then turn airplane mode on and off. When your phone connects it should be working. Buying any of the Travel Add-ons on a postpaid plan only nets you a savings on your roaming fees, it does not change anything about the ability of the phone to roam. Without the Voice / Text / Data Add-on, you can still roam at pay-per-use prices. See this post for more details.