There are a number of signs that you might need to install an app to block websites on phone. For example, if you walk into a room and they’re hiding their phone, that could be cause for concern. What’s more, if you happen to grab their phone and see that their web search history is empty, it might be time for the best website blocker app. And if they refuse to hand over their phone and show you their web history, an Android site blocker might be in order.