I did an online chat with a verizon customer service rep:
Customer: Hello. I have an account with US Cellular and I own a Samsung S3. I am thinking about closing that account. I do not want to buy a new phone, will I be able to activate this phone on Verizon since they are both CDMA phone and verizon also carries the S3?
VZW Tech: Hello! I can understand wanting to use your phone with us. You can sell it to a third party or go on
Cell Phones - Smartphones: Cell Phone Service, Accessories - Verizon Wireless to see if we will give you some money for the device.
VZW Tech: If you activate service with us, it needs to be a Verizon Wireless device.
Customer: Even though they are the same device with different software and a different cover? A Verizon store could just load the verizon software?
VZW Tech: I understand that it is possible, it is something that we do not do.
VZW Tech: If I could, I would have no issues.
Customer: If the verizon software were loaded on by Samsung would a Verizon store activate it?
VZW Tech: I just want to be honest with you. Verizon wireless only activates our devices.
VZW Tech: The device ID has to be loaded in our system, it is more than just software on the phone.
Customer: Verizon can't add the ESN on thier system?
VZW Tech: Verizon will not add a non-Verizon phone in the system.
VZW Tech: I have no problem with it, the company only activates their devices that are made and tested for us.
Customer: What do you mean that you have no problem with it? Doe that mean if I talk to the right person someone CAN add it?
VZW Tech: As a person, I do not see why we would not.
VZW Tech: There is no one in the company that will or can activate a non-Verizon phone on our service.