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Just updated the iOS to 5.1 this morning and now I cannot connect to the internet. WiFi is not available to me right now...

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What happens if you go to Settings → Wi-Fi? Does the network you want to connect to not show up, or do you get an error when you’re trying to connect? Which error? – Mathias Bynens Mar 22 '12 at 13:13
Unfortunately, I do not have Wi Fi access here at my job. But yesterday I did not have this problem in the office...I was able to connect to my email & Pandora with my 3g service. Now all I get is a msg saying "cannot connect to the server" – wbg Mar 22 '12 at 14:58
Ah, so it’s not necessarily a WiFi issue. I’ve undeleted my answer — that’s probably your problem. (I had it too after the upgrade.) – Mathias Bynens Mar 22 '12 at 15:00
@MathiasBynens this is not a wifi specific issue, rather a internet connectivity problem or maybe a 3g connectivity issue? I can receive & send texts + make phone calls - but not use any applications that rely on the internet connection, ie. email, calendar, or pandora. – wbg Mar 22 '12 at 16:00

You will need to re-enter the network settings. Updating iOS seems to wipe these settings.

Go to Settings → General → Network → Cellular Data Network and enter all fields.

To use a VPN connection, Choose Settings → General → Network → VPN and then choose “Add VPN Configuration”. Ask your company’s IT guy for the credentials.

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I'm assuming it's the VPN info I have to enter? Where do I get the correct information to input? – wbg Mar 22 '12 at 16:02
@wbg My answer explained how to set up and/or reset a 3G or Edge connection. I’ve added some info related to setting up a VPN. – Mathias Bynens Mar 22 '12 at 16:04
thank you for your help – wbg Mar 22 '12 at 17:35
@wbg If my answer was helpful to you, please upvote it and mark it as accepted by clicking the checkmark () next to it. Thanks! – Mathias Bynens Mar 22 '12 at 17:42

Try resetting you network settings. Go to Settings > General > Reset > Reset Network Settings. This should do the trick - it did for me.

You will have to enter WiFi keys again, but that's the only downside.

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Rest the network such luck. – wbg Mar 22 '12 at 13:06

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