The RePhone’s GSM, which in Canada is Rogers/Fido and a few others. I’m having good luck so far with a simple Speakout 7-11 pay-as-you-go card (which uses Roger’s network), but fido/rogers nano-sims should work OK.
Incidentally, I bought my 711 sim before they had a nano, so I had to cut down a mini, and it still works perfect. Now they have a 3-in-1 card which includes a nano version. The activation process worked great too, no problems at all. Make sure you keep all your receipts and read all directions if you’ve never used pay-as-you-go with 711 before, it’s a 2-stage process: sim-card activation, then activating the minutes you’ve purchased for your now-active sim. I’ll admit I was nervous until the confirmation sms arrived!
Hope this helps! 