If you have a Lumia 822, you have to open it up to add a micro SD Card. In this video I cover how to check your settings, open the phone and add the SD card.
If you have a lot of music or take a lot of pictures and videos, adding an SD card is a must. Especially if you are like most of us and don't clean things out so often.
Of course, it also allows you to keep more of your favorite music files, movies and pictures on your phone without having to delete some.