My findings of using the Rogers Extended Range Network.

[fixin1]

It seems like the EXT network only works in BC because when I went to Alberta, it would not let me connect back to it.

LTE Only, with the words EXT.

[slusagm]

yes, you can roam onto Rogers as that is mandated by CRTC.  There are few locations where Rogers coverage is present, but Telus/Bell are no and those are area you can use the EXT network with Rogers

From what I know, some part in BC, mainly along Highway 14 between Sooke and Port Renfrew

I also heard roaming on EXT networks on some part of Manitoba

But I know initially, Telus roaming agreement with Rogers is with postpaid customer, so it might or might not work with PM here (but I am pretty sure some confirmed the BC area mentioned above works with PM)