Connection problems, browsers not working.

When I try opening the phone’s browser, or even oper mini, it doesn’t work. (phone’s vodafone browser : connection failure. check settings. if problem persists, please contact your operator for support) and (opera mini : unable to connect to the internet. please check your settings), that’s what my browers say after loading a bit, my sim card is from orange, but the phone was bought from vodafone. Even if it’s an old phone, still works perfectly. Any ideas on fixing this?