My guess: I think the system now has essentially all new site (backbone) equipment -- antennas, feedlines, transmitters/receivers, controllers, etc. -- which should be good for enhanced reliability (and better coverage). I believe the user mobile/portable radios are unchanged. Perhaps some older user radios will be replaced in the future (compliments of Nextel) as part of the rebanding project. I don't know any of this for sure, however.