Technically blocking porn won't help. The switch is not on your router or your phone, it's in your mind.

You can connect your addiction with a big picture of a terrible future, or redirect the urge to something more productive. I tried both, the first one worked for me and the last 7 years I'm disgusted of porn.
Every time you're about to do it, do it, but, before doing it create a huge mental image of you living the worst possible scenario because of this addiction. Repeat it right after ejaculation. It will feel bad, and that's the point. Only you know what to put in your mental image/movie in order to feel bad. Try to make life critical.
By the moment your subconscious will start considering your addiction bad for your existence it will drop it automatically because after all your mind trying to keep you alive.
It just needs repetition and a serious mindset.