Welcome to the community!
Can you confirm is it's the G5 or G6 that you are trying to use. Did you get the phone from Fido or is it an unlocked phone?
Does the phone boot with out the Fido SIM card? If it does do a factory reset and then put in the Fido SIM card and see if it works.
If it does work but your data is not working do another factor reset with the Fido SIM card in the phone.