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I just updated to iOS4 and have found that my old APN settings do not work. I get a
" Could not activate cellular data network.PDP authentication failure".
Now this just happened today. It worked fine until i changed to telstra prepaid sim and than put in my work optus sim. Optus sim can only access the internet through company network. Hence need to use specific APN settings. I've used iPhone configuration utility to define the APN. APN has a proxy server nominated which gets me into the company network.
I have tried all the standard things. Reset network settings, re boot etc.
Any advice would be appreciated.