Background Updating Comes to the Foreground.

"With Background Updating [from Red Bend], the phone is only down for as long as it takes to reboot. The actual update happens in the background while the phone is fully operational. Since the updating process requires memory and processor resources, and these are not as abundant on the phones as they probably are on your PC, running resource-hungry applications, such as watching video or playing some games, would not be advisable during an update, as they might work somewhat sluggishly. But there is nothing to stop you from making and receiving calls, browsing the Web and generally using the phone as you normally would."