Can someone confirm whether CDMA is actually technically superior?

I'm sure I'm compleetly wrong in this, but from my understanding CDMA as a technology, is superior to the alternatives because it allows more simultaneous calls in the same bandwidth. It does this by dynamically deciding how much bandwith your conversation needs, as opposed to allocating it a fixed amount for the duration of your call.

Now, GSM as a standard, is far more usefull. Take your phone anywhere and use it. Flip a new sim in your phone, or flip your sim in a new phone and you're set to go. In theory, the next generation of GSM will use CDMA, but it won't be compatible with what we call "CDMA" stateside, which is the Verizon network.

Matthew