So we need to put in a massively complex, bureaucratic, easily avoided, easily abused, legitimate web site blocking solution "because their parents haven't considered/realised that they need to block wesites and applications on the device."
Some parents also allow their children to smoke, drink, play 18 rated games and watch 18 rated movies too so should we ban those?
The problem is with those parents.
Rather than put something into place that would cost a fortune and wouldn't work why not just try to education those people who "haven't considered/realised that they need to block wesites and applications" on mobiles?
"who cares about anybody else's opinion."
Who cares about the technical details of how to do it and the actual practical effects when someone does try to do it?
Heaven forbid we try and encourage people to take some responsibility....
"block websites"
How?
And how far do you go?
Suppose a web site has a "pornographic" image on it. Do you block the whole web site? Or just the image? That's how the whole Wikipedia web site got locked out a year or so ago. If you block each image or page can you image the billions of things that will be blocked. If I post some porn on here would Mumsnet be taken down?
Who decides if the image is "pornographic"? What about sex education images and web sites?
What happens when, not if, a web site is blocked incorrectly? What is the appeals process? How long is the web site blocked for? What if you're a small business and your site is blocked for days? Who do you sue to make up for the money that you've lost?
What happens when web sites constantly come up with new names and addresses for themselves so as to keep getting around the blocks?
What do you do with Google? They have their own cache of pages from dodgy sites. Do we block them too?
Who is going to manage this ever changing list of billions of things that are blocked?
Who's going to pay for the expensive hardware required to check the web site you're visiting against this black list of billions of pages quickly enough that web browsing won't just grind to a halt?
How long will it from reporting a dodgy web page to the struggling administrators of this system to having it blocked? If you block it immediately then what about people reporting sites maliciously just go get them blacklisted until the overworked staff can spare the time to check it out?
And what about things that aren't actually web sites? The internet is much much more than the web.
And I could go on, and on, and on.
All questions that this ridiculous MP hasn't given one moments thought to, or, more worryingly, decided she didn't have to.
Educating both the parents and the ill informed who think you can just block web sites easily would produce far more results and is the only real way to make a difference.