@Jak16 there's a bit of confusion because many people in the industry use the term "GSM" to mean different things. Strictly speaking, GSM is a very old 2G network standard and as noted, only Rogers operates a 2G GSM network in Canada (so Rogers, Fido, and Chatr customers have access to it); however, it is being retired and decommissioned, I think sometime next year though I forget the date.
However, you will often hear phone reviewers in YouTube videos say things like "this phone will work on GSM networks" but they don't literally mean GSM in that context. They mean that the phone is SIM-based and will operate on networks that use UMTS/W-CDMA (not to be confused with CDMA) networking types, which on the data side are also called HSPA or HSPA+ or HSDPA networks. Especially for reviewers in the USA (or those that target viewers in the USA), this term is meaningful because it differentiates between what they call "GSM" carriers such as T-Mobile and AT&T (though I'm not sure they even run actual 2G GSM networks anymore, but rather UMTS & LTE networks) vs. Verizon and Sprint which still operate CDMA 2G (maybe 2.5G I guess) networks for their calling and texting with LTE on top for data. Phones that work on "GSM" networks in reviews won't necessarily work on CDMA networks and vice versa. It's all a bit confusing!
Now, since you mentioend this was a Sprint device, you can be sure that it does include CDMA. However, most reasonably new models that have CDMA are not CMDA-only (or CMDA+LTE-only) and also include at least some UMTS/W-CDMA frequencies. Just because a phone was originally for Sprint or Verizon doesn't necessarily mean it won't work with Telus/Koodo/PM/Bell/Virgin/Lucky--but it does mean you'll need to check more closely. If a phone was originally for AT&T or T-Mobile, you can be quite sure of it's network compatibility.
So the point of all this was: there is a difference between a literal 2G GSM network and a GSM-technologies-based network (uses SIM cards and UMTS) and you can't always rely on descriptions in product pages or reviews to be sure. You should check the site that @geopublic linked as it is generally quite accurate. However, it is missing many phone models. If in doubt, come back here with the specific model nubmer of the device you want to buy and we can help you determine if it should work.
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