Cellphone, parental control

Question for parents with kids who have cellphones. Is there an AP out there that lets the parent control what Their child see or download?

Bitdefender software has a plug-in for cell phones that links to a web console.

Net Nanny has an app for both types of phones. I use it for my boy with his internet. He doesn’t have a phone. The program is good for what it covers, I just wish it were more configurable i.e. add certain words and it will block anything with those words.