In my experiences the last couple weeks, with a verizon note 5 AND a verizon galaxy s7, the people came in to my shop using att with them and they were blacklisted from verizon. I put my sim in them to test functionality thinking the same thing that everyone shares blacklists. It toasted my verizon sim, and I had to go the store to get a new one. They of course didn't mention they were blacklisted from Verizon.