I'm using a Galaxy S8 active with Fido sim. The devise has AT&T firmware, but that is apparently not an issue, voice and text are working fine.
If anyone reading this is aware of Fido firmware for this device, please revert.
To unbrand my phone from AT&T.To remove AT&T features, settings.To repurpose, reset, hardware permitting, those features and settings to work with Fido network.