2011tv: Their cdma network does not have to close though. It was their voluntary decision to close it. Why not keep it open and start selling the iPhone4 CDMA? Maybe they could do a survey on how many customers would switch from using an iPhone on vodafone's network to theirs.
Prob is with CDMA you are big time limited on where you can roam to, hence Telecom were selling dual GSM/CDMA phones (those samsung ones) to make it easy for people to roam overseas.
Plus Telecom needs the spectrum for XT (i.e to make it faster)