Verizon opened their network up to CDMA devices not branded specifically for Verizon back in 2008.
Verizon Wireless To Introduce ‘Any Apps, Any Device’ Option For Customers In 2008
However, it's an absolute hassle to get them to even acknowledge they will. I spend an hour on the phone with a CSR and had to direct him to the press release on VZW's website stating they do. He put me on hold to come back and tell me that they could, in fact, allow non-Verizon branded devices on their network, but they could not gaurantee it will function properly.
All of that to say this - it can be done, but for sure not worth the hassle.