Vodafone parent support can be accessed here. All Vodafone supplied modems have in built controls.
Support for Spark customers (via Net Shield) looking to create simple filtration for home broadband is here.
Stuff Fibre use a tool called 'Safe Zone' to control and monitor settings. Info and setup can be found here
Vodafone NZ: Set up parental controls on your devices
Set Up Parental Controls on iPad , iPad mini, iPad Air, iPad Pro