02-20-2013 01:22 PM
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Have you tried a Battery Pull Restart ! If not then do it by removing the battery while your device is Powered On , wait for a min then re-insert it back, after reboot see if it allows.
02-20-2013 02:13 PM
If a Battery pull is unable to resolve the issue then as a next steps you can try Reloading the OS . But first do a Backup of your Device, for help refer to this Article : How To Backup Your BlackBerry . Once it is done you can reload your device software , for that refer to this Knowledge Base Article :
KB11320 : How to perform a clean reload of the BlackBerry Device software using BlackBerry desktop software for windows
After reload don't Restore any applications from your Backup do a selectiv restore , sometime a bad app can also create such issue , So restore only your contacts and calender entries. If problem resolves then restore only BlackBerry Native application one by one , to see the results.
KB10339 : How to use BlackBerry Desktop Software to restore data to a BlackBerry smartphone from a backup file
If even after OS Reload those issue remains , then I am sorry to say that you have to contact your Carrier or your service provider to get it fixed.