+ IOS (Apple) Phones - The language of the App for IOS phones is dependent on the language of the phone. For instance, if your phone language is set to Japanese, the app will also display in Japanese.
To change the language of your iPhone, go to the iPhone's settings app (the one that looks like a gear), scroll down to "Language & Region" and then select a new iPhone Language and confirm. When you re-enter the AirVisual App - your app language will have changed.
+ Android Phones - For Android phones, it is possible to manually change the language of the app inside the AirVisual App. Simply go to your apps settings, scroll down to "User Interface Language" and change the language.