Do you have data enabled? You need to have your cellular data turned on to send/receive mms, although it doesn't count towards your data usage.
Do you have 3G and cellular data enabled? Can you browse the internet with your data?
According to this article, Wind phones use a different frequency and aren't compatible with Koodo's network. http://help.koodomobile.com/getting-started-with-koodo/sim-cards-and-non-koodo-phones/what-is-an-hspa-phone
You could ask at a kiosk to see if they have any 4s' from before iOS 7 was released. It hasn't been very long, you might get lucky. That, or buy a used phone from somebody.
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