Discuss iPhone 3G AT&T 2.2.1, cant get 3G to work on o2 UK at the iPhone 3G - Hackint0sh.org; Try putting only your O2 sim into an old phone (such as Nokia), make a ...
Try putting only your O2 sim into an old phone (such as Nokia), make a call (such as to voicemail), then try to connect to internet (it should connect). then put your sim with Tsim back into 3G iPhone. Then make sure your APN settings are installed. Now try and connect.
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