I have a new unlocked Galaxy S2 (formally locked to the Rogers network in Canada) that I unlocked. I put my ATT sim in the phone and the voice, txt and voice mail work fine but every time I try to get on the internet via the web browser I get an error message that says "no internet connection". I have turned of the phone, pulled out the battery, waited 5 minutes and turned the phone back on but still the same issue. I have the data roaming box checked and packet data box checked but still same error message. I am not using a vpn client, the network operator is on automatic, and the network mode is on automatic. There are no issues getting an internet using a wifi connection.
Any idea what the issue could be and how to resolve it?