Default Region Unlock USA S5?

How do you get past the region lock on the USA S5s? In Europe, you have to activate a phone with a European carrier and make 5 minutes of phone calling to remove the region lock.
In the US, I assume you have to do the same (i.e. Activate and talk on a T-Mobile S5 for 5 minutes with a T-Mobile SIM before the unlock code will region unlock it)?
Has anyone tried this? Please let me know!

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