How to log out of Facebook Messenger on an iPhone, through Facebook's desktop site or mobile apps
You can log out of Facebook Messenger on an iPhone to help you eliminate distractions. Here's how to do it via Facebook's desktop site or mobile apps.
13 Jun 2019 ... 4. Under the "Where you're logged in" section, look for the device which is logged into Messenger (it will say so beneath the device type) ...