I think one of you is confused or mistaken. You can use any Icon on most networks (maybe not Sprint). I'm using mine on Ptel, which is an mvno of T-Mobile.
Ok to clarify:
The Icon
can be used on Verizon's CDMA and LTE network (its a Verizon exclusive) and
any GSM network as well as non-US LTE networks. It
cannot be used on any other CDMA network unless
Verizon unlocks it (Verizon controls its CDMA keys, nobody else does). Also, it doesn't seem to work on AT&T and T-Mobile LTE networks (wrong bands), but works on their HSPA+ (H+) networks. Though there has been evidence of people getting it to work on AT&T's LTE network, but not reliably.
The 930 will work on
any GSM network and non-US LTE networks, but
won't work on any US LTE networks (wrong bands), nor will the 930 work on any CDMA network (it does not have CDMA).
Factory unlocked is a marketing term and is referring to GSM phones. If the phone is CDMA, it is locked to a specific carrier and cannot be unlocked by the OEM. If an OEM did that, they would get into serious trouble since CDMA relies on a specific key baked into the firmware and tied to a specific carrier; Verizon in the case of the Icon. Both Verizon (and Sprint) control their respective keys and provide them to the OEMs for inclusion into the firmware. GSM and LTE on the other hand are tied to the SIM (and frequency band) and does not require any special CDMA keys. Therefore, as long as you have a carrier activated SIM, you can use it on whatever network that SIM is tied to (i.e. AT&T, T-Mobile, etc.).
Does that clear things up?
Edit: To get LTE in the US, you have to have a provider that operates in the GSM 700MHz Class 13/1700/2100 bands. There are a few providers in the US that operate in the 1700 band such as Ptel and Metro PCS.