Sim Card for traveller:
1. Can use in Yellowknife
2. Share hot spot
3. Canada nationwide calls and data
4. 9 days
5. Best price
Welcome to the community!
According to this screen capture, there do not appear to be any Fido/Rogers towers in Yellowknife.
Screen capture taken from here. I cannot vouch for accuracy.
That said, if you are only visiting Yellowknife, turning on roaming will allow your phone to avail of extended coverage and roam as Fido-EXT. So you will be able to use your phone (with Fido SIM) in Yellowknife. Since Yellowknife is in Canada, there would be no need to purchase any additional travel packs or Roam from home. Depending on your plan, you may be able to share a hotspot, have Canada nationwide calling and data, etc.
If you are planning on living in Yellowknife permanently, Fido/Rogers will likely not be an option as extended coverage is only meant for occasional usage.
Hope this helps