Support No internet unless connected to WiFi HELP!

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http://androidforums.com – Hi... i need help. I have an AT&T Samsung Galaxy S 2. I can NOT connect to the internet unless i use WiFi. :confused: I have had the phone for about a month and it has been like this since i got it. I have been going back and forth with Straight Talk about it forever! They have done nothing to help me. :frown: When i try to connect to the internet without using WiFi it says: "web page not available, please check to see if your device has a signal and data connection" OR "can't find a secure connection" OR "can not display web page, please try again" OR "C (General)