| | Confirmed. The Active Carrier does disappear after some time.
After a few days the Active Carrier field is again blank for all my users except two of them.
Too bad this information does not stick, I find it useful to know which carrier my constantly moving users are on, but I would hate to have to keep sending the Service Books.
Regarding the two users for which Active Carrier is still showing, their devices are plain old 8100s, no special configuration, no special IT Policy, no 4.5 OS.
By the Way, my server is version 4.1.4 - perhaps more recent version of the BES software did address the issue? Not a good reason to upgrade though when everything else is working perfectly.