For now there is very little options if any to network unlock your CDMA device. Verizon's 4G LTE devices is that they support the use of SIM cards, and some Verizon devices have their SIM cards unlocked. If you break or lose your device, for example, you're probably going to have to have a headache getting a new one to use because there's a chance you'll have to pay full retail price for the device (unless you have insurance or some other deal worked out). On Verizon, your phone has to be compatible with the carrier's network. To this day, you can't just go out and buy an unlocked device and expect to use it immediately on Verizon, if at all. With Verizon you have the inability to easily swap phones on Verizon's CDMA network. The majority of the rest of the world was using GSM technology, and the countries and regions that used CDMA weren't always compatible with Verizon's devices. Verizon phones are not great for traveling abroad. Some Verizon phones will simply display Non Verizon SIM with no option to enter in the unlock code. Make sure you read the service description before ordering as some services do not offer refunds if your phone does not prompt automatically for a code. Here you can enter in the 8 digit unlock code as shown below:

In this case the message displayed will say this sim card is not from verizon wireless. The Verizon network unlock method is different from most carriers as they do not use the typical 8 digit unlock code. The Complete Verizon Network Unlock Process If you are interested in this service you can contact us. And this too is only possible for some handsets. It would require rooting the device and updating the modem firmware and ROM to get it to work. There are also some Samsung models and android models which can be 'made to work' with GSM networks however it is not a simple process. If it is at all possible, Sprint would need to register the IMEI or MEID number in their system first before the phone can work

To use your Verizon iPhone on another CDMA Network like Sprint in the USA, you are advised to Contact Sprint to ask them on a case to case basis. Because of the technology limitations with CDMA devices, with the exception of the Verizon iPhone which has GSM capabilities by default, and can easily be unlocked and used on GSM networks. In short, it is not possible to unlock most Verizon phones to use on other carriers. How To Liberate your Verizon CDMA Phone from it's carrier?:

Verizon sim unlock pin