Use a parental control app
Use a DNS filtering app
Set up website blocking in your router
Use browser restrictions in phone settings
Add the website to a block list in a firewall app
Use Screen Time on iPhone
Use Digital Wellbeing or Family Link on Android
Install a safe browser with site blocking features
Edit the hosts file on rooted Android devices
Use a VPN app with website blocking
Block the website through your mobile browser settings
Use a third-party content blocker app