Model A1524 not support CDMA

My iPhone 6 is model A1524, which is bought in Hong Kong. I have read the specification of the phone, learned that this model support all the network. However, it seems that it does not support CDMA network. After many times of trying, I found another note for the unlocked iPhone in the HK official website.

About the unlocked iPhone

The unlocked iPhone includes all the features of iPhone but without a wireless contract commitment. You can activate and use iPhone on the supported GSM wireless network of your choice. The unlocked iPhone 6 or iPhone 6 Plus will not work with CDMA-based carriers. An unlocked iPhone 6 or iPhone 6 Plus may not support LTE networks in all other countries; contact service providers for details.

If you don’t want a multiyear service contract, or if you prefer to use a local carrier when traveling abroad, the unlocked iPhone is the best choice. It does not come with a nano-SIM card, so you’ll need to get one from any supported GSM carrier worldwide. To start using it, simply insert an activated SIM card from a compatible network. Then turn on your iPhone and follow the onscreen instructions to set it up.

Does it mean this Hong Kong A1524 has blocked CDMA network? Is it a permanent disable by hardware or in a software way? If it is software way, can CDMA be enabled?