When updating phone information from a UCM or UCME system it's possible that no devices are imported and you see the following error in the Activity Log:
Time difference between application and group too large
This happens if the time on the PC running PhoneView and UCM/UCME is too great (ie. more than 48 hours)
To fix this issue simply ensure the time on the PC running PhoneView, UCM or UCME is correct.