Well, after weeks of testing and trying different unlocked iPhones with sims from Koodo, Rogers, Eastlink, and Bell I have come to the conclusion the Koodo/Telus SMS/MMS gateways are what I refer to as "Summer" gateways, sometimes they work and sometimes they don't. I have tested the Bell gateway and not one test failed to deliver a text. Rogers was also near perfect except it asks you for confirmation before presenting the text. Refer to my initial thread relating to not being able to get alarm notification from my home alarm on my Koodo prepaid. https://community.koodomobile.com/koodo/topics/not-receiving-sms-from-home-alarm-system-was-working-for-one-day-now-nothing
Based on my research Koodo prepaid was the best deal that I could find. I love it except without the ability to get my home alarm notifications it doesn't serve my number one need. My home alarm provider confirmed they were sending the notifications and I have no reason to doubt them, they were all received on my unlocked iPhone with Rogers, Bell, & Eastlink sims loaned to me by friends. With my Koodo sim using the Koodo gateway I got none. With my Koodo sim and Telus gateway I received every notification for a 24 hour period, then nothing. I've tested at least five different free text sites and Bell, Rogers, and Eastlink sims in my iPhone and got 100% of the sent texts. Koodo gateway was minimal success and Telus was better but only about 70% success. Once my Koodo prepaid minutes and data runs out I guess I will be forced back to Bell, Rogers, or Eastlink so I can get my home alarm notifications.