Clearing the cache on an iPhone
These instructions are now updated based on iPhone running on iOS 10.3.2, but it should be the same for all recent versions of iPhones.
Step 1: iPhone Settings
From the main screen, click on Settings.
Your iPhone Settings menu should now be displayed.
Step 2: Clearing Cache
Scroll down and select the option labelled Safari.
Tap on Clear History & Website Data.
A pop up message will appear to confirm your choice.
Tap on Clear History & Data again to proceed.
Step 3: Cache Cleared
Your iPhone will work for a moment and the process will complete. You've now successfully deleted all your browser History & Cache Data from your iPhone!