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Pdp authentication failure

Unable to access the Internet from my iPhone. Message being generated: PDP authentication failure

iPhone 4S

Posted on Sep 30, 2012 11:31 PM

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Posted on Oct 29, 2012 7:46 PM

I recently had this problem on my iPhone5. At first I thought it was just the cell towers where I was, but it kept happening in a different part of town. I was able to clear the condition simply by doing a hard reset (hold "home" and "power" together until you see the Apple Logo on the screen).


So this sounds to me like a software bug in IOS. Some state is getting corrupted in the cell driver.

39 replies

Apr 3, 2015 8:35 PM in response to Ashtown

I had the same issues using my US T-Mobile iPhome in India . The reason was it was connecting to a network which was not allowing authentication...

It was a easy fix - just select a different carrier and you will be all set .


Steps -

Settings -> carrier -> uncheck automatic selection - > select a carrier

you may have to hit n try which one works.


if you are in India, try Vodafone or airtel


Good Luck!

Pdp authentication failure

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