Welcome to the community!
Unfortunately, there is no way for Fido to do what you need on the line but I know if you have an android phone you can set up a family link and you have some parental control on the device see here.
Depending on what you want to block they have apps that can do that but I found the best ones need root access and that's something for advanced users and not all phones can be rooted.
My son was into watching anime shows and I found some of the sites to be too pornographic or did a lot of phishing just like you I can control most of the stuff from my network but when he is off or at school was a different story at that time I was able to root the phone and had a systemwide adblocking that used to block out all those sites but with the newer phones, it's difficult or not even possible to root. I just had a talk with him and I've not had any issues and he seems to use his devices responsibly.