I just checked my default permissions (I have the same .681) and I can change mine, Sounds like you might have some sort of IT Policy on your phone.
Easy way to check, go into Options / Status
In the Status screen, type in "B U Y R"
This should show 3 new status' Data Usage, Voice Usage, and IT Policy. If the IT Policy shows anything other than "Disabled", you need to wipe the phone.
Actually pretty easy to do, connect the phone to the computer, then go into Start / Run and type in CMD
From there, go into this directory C:\Program Files\Common Files\Research in Motion\Loader\ and type in the following
loader.exe /resettofactory
A screen will pop up momentarally, then the phone will reboot and wipe itself. From there, it will be like the day it came out of the box, just running .681 OS
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