Instead of disabling the browser completely it would probably be more prudent to use a white-list of websites which the iPhone allows as well:
Restriction -> Websites -> Specific Websites Only
Restriction -> Websites -> Specific Websites Only
I would rather be able to change the hosts file tho and while I'm blacklisting sites I'd also get rid of ads.
That depends on the icon:
http://img1.wikia.nocookie.net/__cb20131127043932/marvelmovi...
The only way to deal with this is to better understand your own personality and try to learn how to get self control. There are lots of cognitive therapy based behavioural modification techniques. Self control only when it's interesting isn't really self control.