| | problem installing 3rd party software in att unlocked phone
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I bought an ATT unlocked phone over the internet. But I can not use the blackberry appworld to install any software, including the Blackberry messenger, because it shows me a message that says that I can not install any 3rd party software and I should contact the IT support bla bla bla. How can I get rid of this message and be able to use desktop manager or blackberry appworld. Or is there any other way to install such free applications??