Is it possible to factory unlock a Verizon iPhone 4s?

I want to factory unlock a Verizon iPhone 4s. This person is telling me they can't and someone told me it's not possible, only AT&T phones can be factory unlocked.

You can't "Unlock" a CDMA phone to work on another carrier like a GSM phone.

Verizon = CDMA carrier
AT&T = GSM carrier

You will get your answer here https://community.verizonwirel…

Yes, you can have the SIM unlocked on Verizon 4s. There are several steps but contacting Verizon will be the best start to get the unlock code. NOTE: the radio signal is CDMA. So it can only work on a CDMA network. So no ATT or Tmobile for you. Sprint on the smaller operations are your choices.
Best luck.
https://discussions.apple.com/...3#24286423