How to block/hide the internet on a mobile device?

Anyone know of any successful apps that block/hide the internet on a mobile device? I have used a few apps, but none seem to work. Ok, I just done it.
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We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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