go to "Options"
go to "Applications"
Press "Menu" then " edit permissions"
and click " allow" on all applications
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The Blackberry Curve 9300 is much better than the 8520 because the 9300 has a faster processor and Internet connection as the 8520 doesn't, but the 8520 is much cheaper than the 9300 but i recommend the 9300.
subscribe to the BIS service from your mobile service provider. Once you do this the icons for internet and mail will automatically appear. Incase you do not want to do so, try to activate the WIFI (I do not remember if 8520 has it). That will work too.