When using your Lumia 820 internet browser, various data and cookies maybe stored temporaily.This may cause you problems with loading some sites.To manage and clear your cache, cookies and other data, follow these instructions.
Slide your finger left on the display.
Tap Internet Explorer.
Tap the dots in the bottom right corner of the display.
Tap delete history.
Tap delete to confirm.
Tap the Home key to return to standby mode.