question: How to prevent potential data leaks on iOS with ExpressVPN app settings
answer: 
  User data leaks have historically been an issue with Apple’s iOS products. iPhones (and some Mac devices) can potentially leak your IP address or cleartext traffic if the service you’re using does not make use of TLS. This happens even when you are using a VPN, but only if you are connected to a malicious Wi-Fi or Ethernet access point (i.e., one controlled by an attacker).
  
  ExpressVPN is committed to providing the best protection to our users and recommends the settings detailed below.
  
  How ExpressVPN keeps you safe
  
  ExpressVPN works alongside security research groups in protecting you against potential threats and delivering a secure VPN service. One of the research groups notified us of the security issue and an investigation is underway. We will be disclosing the full details with you soon.
  
  Meanwhile, we have added fixes to the ExpressVPN app for iOS to secure your connection. You can enable certain settings in the app by following the steps below.
  
  How to secure your connection