You just bought Nexus 4 and you don't know anything about Android operating system, so I will guide you through literally first steps on this great phone.
If you are on a certain data plan on your mobile provider, and don't want to exceed it, you can set data usage warning and a limit which can help you save some of your money.
Samsung Android devices such as Galaxy S2 or S3 come with a cool app called Kies Air, enabling you to connect via WiFi connection and manage them using a web browser.
Samsung Galaxy S3's screen is so beautiful that not watching movies on it is almost ridiculous. And if you own some other type of a smartphone than this tutorial is meant for you as well.
If for some reason your Android powered smartphone does not perform as good as it used to, or you want to sell it I suggest you to bring it to its original factory state.
In case you didn't know, you can turn you LG G2 Android powered smartphone into a Wi-Fi hotspot and use it to surf the web with any other wireless device like notebook, tablet or a smartphone.
A really useful feature in case you want to receive a warning notification before you use all of the mobile data available according to your mobile provider contract. It's a great way to avoid additional charges.