How to Clear the Cookies and Cache on a Mobile Phone

iOS - Safari

  1. Open the "Settings" App, and navigate to the "Apps" section.
  2. Find and select "Safari."
  3. Tap the "Clear History and Website Data" button.

An iPhone displaying the Safari settings. At the bottom of the Privacy & Security section, there is a Clear History and website Data button.

Apple Support: Delete your Safari history, cache, and cookies on iPhone. 

Android - Google Chrome

  1. Open "Chrome."
  2. On the right of the Search Bar, Tap the Kebab Button ( ⁝ ) to display an Action Menu.
  3. Tap the "Delete browsing data" Button.

Google Account Help: Clear cache & cookies.