I have updated my Ipad 2 to ios5 and now don't have a calendar on my ipad but the calendar is still ok on my iphone and imac

Today I updated my iPad 2 to IOS5 and now I don't have a calendar on my iPad but it is still on my iPhone and iMac.  Can anyone help me please?

Hey there johnnyb141,
It sounds like you are are connected to your cellular network but cannot get cellular data to work when trying to surf the internet with Safari. First I would check in the Settings to see if Cellular data is enabled, or if Safari is disabled in the Cellular settings:
For the following options, go to Settings > Cellular Data and turn the options on or off, or follow the onscreen instructions.
Turn Cellular Data on or off. If Cellular Data is off, all data services will use only Wi-Fi—including email, web browsing, push notifications, and other services. If Cellular Data is on, carrier charges may be incurred. For example, using certain features and services that transfer data, such as Messages, could result in charges to your data plan.
From: iPhone User Guide
          http://help.apple.com/ipad/7/#/iPadbfe780eb
If it is turned on, and Safari is enabled, I would next try the troubleshooting in this article:
iPad (Wi-Fi + Cellular Models): Troubleshooting a cellular data connection
http://support.apple.com/kb/TS4249
Thank you for using Apple Support Communities.
Take care,
Sterling

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