Using CDMA mobile phones

I was thinking if it is possible for one to use the cdma phones (from Nokia or HTC) in Pakistan or do the cdma providers in Pakistan only allow their own Handsets?

in kashmir, i have seen people using cdma sets for their SCO connections.

But does it support roaming? I know officially it is not allowed but some say that roaming works on cdma in Pakistan. Anyone have any info about this? and if this is possible then i think cdma is a relatively cost effective option compared to GSM.

roaming is allowed on SCO CDMA within kashmir

Roaming isn't officially allowed but it works fine atleast withing city. I am not sure about other parts of counry.

Thanks for replies.