Rafael Henrique/SOPA Images/LightRocket via Getty Images
You can clear the Messenger app's cache on an Android phone by opening your device's "Apps" menu. On an iPhone or iPad, the only way to clear Messenger's cache is to delete and reinstall the app.Messenger, the standalone chatting app that used to be part of Facebook, is one of the most popular apps in the world. It's not hard to find someone whose entire life revolves around Messenger...