I am planning to buy a Onepls 7 pro and I noticed that Fido isn't listed on the oneplus website with the networks that are compatible with the phone. So I wanted to ask will the Fido sim work with the phone or not?
Welcome to the community!
Assuming the version of the phone you're planning on getting is the Canadian version, it should have all of the compatible bands/frequencies for the networks. Also, Fido and Rogers share their networks.
While the phone should work on the networks, you should note that certain features (ie Wifi-calling and/or voLTE) won't likely work since the phone is not a Fido device.
Hope this helps 😀