I updated my iPhone4 to iOS5.1 and my ' ' symbol in my Contacts and Calendar have now disappeared.  How can I get them back?

My + symbol is gone from my contacts and calendar.

Did you try to reset the phone by holding the sleep and home button for about 10sec, until the Apple logo comes back again? You will not lose data doing a reset.
If this does not work, set it up again as new device, without using the latest backup afterwards.
How to back up your data and set up as a new device

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