This is my understanding of the matter:
1XEV is Verizon's version of the 3G networks so widely advertised by every carrier these days. It is CDMA EV-DO, either Rev. A or Rev. 0.
The 3G indicator in the manual refers to GSM 3G. It runs on different bandwidths than the CDMA technology and therefore is different and capable of different things.
I'm sure someone has a much more technical answer.. or even a better, clearer answer than mine and will be posting it shortly.