Its a reality of the modern world that a lot of people love to play games on their phone. For the most part this can be a waste of time, but not always. Some games are actually language focussed, when you search for "learn English" or "English vocabulary" in the app store you will find a lot of apps. But you probably won't use them when you mind is tired. In fact, you may never use them at all.
The reason why is that they are probably boring.
So instead of downloading them, look for apps that include characters and a number of challenges within the game. If you really enjoyed watching a cartoon, or playing a game when you were in school then you could start by searching for them. One example is an app based on the American cartoon "The Simpsons". The app is called "Tapped Out" and in the initial part of the game there are a lot of conversations between the characters as you try to build up the town after Homer blew it up.
While the dialogue later on in the game is reduced, you can still learn a lot from playing games that you are interested in because of the characters. You will focus on completing the challenges, unlocking new characters and items, and you won't worry as much about memorising what you are reading. Often you need to learn the rules of how a game works and read jokes. The jokes are sometimes based on cultural references, but if you are interested you can search for the references, or ask native speakers such as your teachers or flatmates.