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I've bought an iPhone 4 and the text and calling work fine, as does wifi. However, when trying to use internet without Wifi I get a "Could not activate cellular data network - PDP authentication failure".

How can I fix this?

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3 Answers

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There have been a lot of different attempts to fix this general error in different ways. Some of these may work for you.

  • Remove the SIM card from iPhone 3G, turn off the phone, reboot, then reinsert the sim card and wait an hour or two.

  • Go to Settings -> General -> Reset -> Reset Network Settings on your phone to reset the network setting on the iPhone.

  • if nothing else works, call AT&T and have them reset your number.

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Resetting the network settings fixed it for me... even though nothing changed. Very strange! – GiddyUpHorsey Nov 11 '10 at 21:05
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Try to hard -reset the whole phone using the power and the home button.

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This does not provide an answer to the question. To critique or request clarification from an author, leave a comment below their post - you can always comment on your own posts, and once you have sufficient reputation you will be able to comment on any post. – Thecafremo Feb 20 at 14:03
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You might also try going into Settings > Carrier and choosing manual carrier selection - bizarrely enough, that worked for me. See http://apple.stackexchange.com/a/52624/12164

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