Might be a couple of things, given taht you did the phone OS and DM upgrades pretty close together. (No harm in that, I've done it myself-just need to start narrowing down possibilties).
Basics first: Have you done a battery pull as yet?
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1st Step in Troubleshooting: Do you have a BlackBerry Data Plan?
2nd Step in Troubleshooting: Pull the Battery.
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