You are incorrect though.
"3G CDMA networks (known as "EV-DO" or "Evolution Data Optimized") also, generally, can't make voice calls and transmit data at the same time." - Section
(3G CDMA networks (known as "EV-DO" or "Evolution Data Optimized") also, generally, can't make voice calls and transmit data at the same time. Once more, that's an available option (known as "SV-DO" for "Simultaneous Voice and Data Optimization"), but one that U.S. carriers haven't adopted for their networks and phones.
On the other hand, all 3G GSM networks have simultaneous voice and data, because it's a required part of the spec.)
http://www.pcmag.com/article2/0,2817,2407896,00.asp
Additionally,
"Additionally, GSM (and UMTS) phones can send and receive data packets while making a call, which most CDMA networks still don't support."
http://gizmodo.com/5637136/giz-explains-gsm-vs-cdma
The only reason phones like GS3 and GS4 can use data and phone at the same time is because Samsung allowed a sim slot in those phones which verizon could utilize. Most other verizon phones don't have that. GSM already requires sims in all their phones, as everyone already knows.
Every 4g phone from Verizon has a Sim card just like gsm and it is 100% apples fault that the iPhone 5 on Verizon can't do voice and data when there are plenty of other CDMA phones on there network that do it.