Who I have the same questioned this topic

I have blocked the Mobile Web and all download features on 3 of our 5 phones that are in use.  What I don't understand is why offer the blocking option if we are still being charged when the button is pushed on the phone?  Isn't that what that option means?  I blocked it therefore it shouldn't be able to be used?  Someone please help me understand why they offer the option if they're still going to charge just for pushing a button on the phone? 

Thanks for any answers anyone might have.  We have a family plan which includes the web, that's why the phones have this option.  It was the cheapest plan for all of us to have.  We need unlimited texting and 2 of our phones have to have this option.  They don't have a plan that is offered for individual phones to have the web in a family plan.