You misunderstood that post. There were two main points in that post.
1. My E4 was unlocked (using a code bought on Ebay).
2. I was quoting another member who said that one can use the Change Carrier option to trigger the screen to enter the unlock code, instead of putting in a non-Verizon SIM to trigger the screen. The Change Carrier option goes away once the phone has been unlocked.
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