Why will iPhone 4 MC610LL recognize my global SIM while MC319LL will not?

I have 4 Unlocked iPhone 4 - Two MC319LL and one each MC610LL/A and MC609LL all of which will work on either the AT&T or T-Mobile networks. Both of the MC610LL/A and MC609LL will recognize my SIM Pin Locked Global SIM both making and receiving calls. Neither of the Two MC319LL will unlock that same Global SIM and both return "Invalid SIM". Can someone explain why?

I work through a contractor with direct access to Apple's database and all phones return "Initial Activation Policy Description: US GSM Country Default Policy Lock Status: Unlocked" for their respective IMEI and Serial Numbers while a known Locked phone verified at the same time returned "Simlock:locked".
Even without verification, I maintain active T-Mobile and AT&T SIMs and have never known a Locked phone to work on both the AT&T and T-Mobile Network with a SIM swap.

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