The best free app to boost the network signal for an Android device is the Network Signal Speed Booster. Over a million people have downloaded and used it. Nearly 150,000 people have rated it as of 2015, currently giving it an average rating of 4.4 for performance.
This app is useful for YouTube because it helps to buffer videos without having to wait. It also accelerates Wi-Fi speeds and improves signals, which is ideal for those who live farther away from local area networks. The app is also reliable for surfing the Web, saving battery life, playing music and gaming. It is only compatible with Android.