Unable to Display Webpages Correctly on Nokia Lumia 800

Hi. I am using a Nokia Lumia 800 and I am having some issues on my Internet Connection. I don't have issues on connecting to Wi-Fi, but when going through my browser to my Network settings to connect, it will work fine for few days and then later, my browser won't display webpages correctly. I checked on the settings and there seems to be no issues. I saw a 3G sign and that I am also connected to the Internet. However, I am unable to browse any web pages. I want to know if this is an issue with my phone or with the connection itself. Please send me some guidance and help. Thanks.
