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!
Step 4: Other Browsers
If you wish to clear the cache for a different browser/device, please refer to our instructions which can be found here.