Originally Posted by digitalextremes

This happens because you forgot to update the date/time on your blackberry, most of the issues that people are experienceing when certificate expired etc is because the time/date on the handset is not connect, its probably showing time/date before TMO started UMA Service.

Or you might want to install desktop manager with custom option and install Certificate Sync so that you can see all the root certificates...there should be one called T-Mobile something...make sure there is a green checkmark in front of it.