IPad2 got a terrible trouble with 3G network after updateing to IOS5.1.1

Hello guys, I got a terrible trouble with 3G network after updateing to IOS 5.1.1. Now when I turn on my cellular data, the iPad 2 can say the carrier and 3G on the left top. But when I tap the Safari, it turns to be:"PDP authentication failure". I did the update to 5.1.1 last night, before that every thing is fine, and now I can't use my 3G at all.
Could anyone please tell me what's happing and what should I do???
Thank you so much!

Hi Miky. After upgrading to ios 5.1 I had the same problem.
I reset the APN on network settings and rewriting the same. iPad now working on 3G.
My operator is 3 ITA
iPad 1 64 GB Wi-Fi + 3G

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IPad2 got a terrible trouble with 3G network after updateing to IOS5.1.1

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