Please help: Using a Verizon 7 EDGE in a GSM market with new SIM?

How do I get a Verizon S7 Edge to recognize a new GSM SIM? I want to use it on another carrier, and Verizon says it's not SIM-locked/carrier locked but when I put in the new SIM, it's not working.

Factory reset didn't work. Would an Odin flash work? IF not, what would?

Thanks. Not sure if I'm asking in the right place.

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