There are so many different accessories for your phone nowadays that it’s a bit difficult to pick which ones would actually be useful. Apart from headphones and cases, you’ll probably want something along the lines of a stand, and a tool to keep your device looking shiny would be nice as well. However, these are things that would be silly to buy separately as it’s just going to be more that you’ll have to tote around in your bag.
The Micro Light Smartphone Pack is a set of tiny tools that will provide you with a stand and a screen cleaner that has a built-in LED light. Both of these should easily fit on your keyring. While it may not look very big, the stand can support your smartphone in either a vertical or horizontal position. The cleaning cloth is made of microfiber, and will make sure that your screen is clean enough to eat on (but you probably shouldn’t try it). This set will only cost you about $10, and is useful as a pair of LED flashlights if you’re not interested in the other features.