Most websites DETECT what web browser you are using and serve up the right page.
However, if you do notice a page loading as something like m.google.com, type in the full address (Put in the WWW instead of the M). Sometimes that works. Sometimes you have to look for a link on the mobile version of the web page that says "Vew full site."
On Blackberry, we could go into the browser and choose if we wanted it to identify itself as Blackberry, IE or Firefox to trick websites. I've yet to find such a setting in the default browser on Android.