I have an option at work to get a discount on both Verizon and at&t. I chose at&t.
While I don't have the need to go on the internet while talking on the phone I like the option to do so if I really needed to that .01% of the time.
Is that a limit of CDMA?
The other thing I didn't like about Verizon is the lack of SIM cards. I've had several situations where swapping the card to another phone was lifesaving. The old phone died at night, and I needed a phone. I grabbed an old phone, popped the SIM in, and it worked. I didn't need to go to the store to make it work. -- Give me Liberty, or I'll give you death!
The Verizon phone has a SIM, all LTE phones have SIM cards.
The Verizon phone is also compatible with the normal CDMA technologies (EVDO Rev A and B), LTE on Verizon and Sprint, and GSM/HSDPA+ on T-Mobile and AT&T. So basically it can do everything the AT&T phone can do minus SVDO and AT&T LTE.
Regarding that last part... I love being able to swap batteries
That being said... CDMA, on it's own, cannot support both data & voice streams simultaneously. However, Verizon's LTE handsets use both CDMA radios and an LTE sim, which means that the data goes over LTE & the voice goes over CDMA.
However, the iPhone is an exception (as per usual) lol.