To reload a page in Mobile Safari from a remote server or clear up space on your iPhone you may want to clear the browser cache. Files are automatically stored in the browser cache just like they are on the desktop version of Safari and in other web browsers. This helps to speed up web page loading on sites you have already visited.
To clear the Safari cache:
1. Navigate to Settings -> Safari
2. Scroll down and touch Clear Cache.
3. Tap the Clear Cache button.
Your Safari browser history and cookies can also be cleared using the same settings menu.