unable to connect via Opera min on Nokia N70, the right settings?

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Hi! I am using Nokia N70, I want to reduce the data charge so I want to try Opera mini. I have downloaded the N70 version on Opera's website and installed. However, it doesn't work! After the loading bar and "installing" word, it always shows a message 'Failed to connect to the Internet Go to http://www.operamini.com/help?version=4.2 with you desktop browser or contact your service provider for internet settings.' I have been to that web site but I can't find any information about this, I called the carrier, they say that they don't have informations for this third party software, but they know that it is possible to browse the web with their network by opera mini. However, I can surf the web by the internal browser, can anyone help? I appreciate any kind of help! Thank you!