Since Rogers is decomissioning their entire GSM/GPRS network by December 31, 2020, will Fido do the same as they're on the same network?
I really don't want to upgrade my phone.
Fido does not have their own Cellular network. Fido is a cellphone brand that uses the Rogers Cellphone network which Rogers also happens to be Fido's parent company so what ever Rogers does, Fido is affected. Since Rogers is decomissioning their GSM network, Fido will not be able to have access to this network once its decomissioned, but thats not a bad thing, they still have access to the 3G and 4G netoworks
Welcome to the community!
As mentioned above, Fido no longer operates a separate network. Since being acquired by Rogers (circa 2004), they now share their networks. Both Fido and Rogers customers can access and use all the towers of either network.
So it's Fido/Rogers who's decommissioning the GSM network. I understand there are some customers who might still rely on that network. However, the majority of customers do not use GPRS anymore. It is simply too slow to be useful in today's high data society. To stay competitive with the other main providers, they need to re-farm the GSM frequencies to the LTE network as additional aggregation bands.
Unfortunately, that means you will have to upgrade a GSM-only phone before they decommission the network entirely. Once the sunset occurs, there will no longer be any nationwide GSM provider. I recently upgraded my mother's phone because there were rumours the GSM sunset was to occur in 2018. If you are adverse to smartphones, there are some non-smartphones which would allow you to use the UMTS (WCDMA) network.
Hope this helps