...They're known to activate Verizon-locked iPhones on their network if you get the right CSR on the phone.
This may seem impossible, but it works this way with GMS phones on AT&T MVNOs also. For example, you can buy a Straight Talk Nokia e71 which is elegible for the $45/month unlimited data/text/talk plan and stick its SIM in your AT&T-locked iPhone without a problem. The only issue you encounter is not being able to change MMS settings on an AT&T-locked iPhone. If you want to send and receive MMS on a locked iPhone with Straight Talk, you need to jailbreak (but not unlock).
The same thing works with H2O which is another AT&T MVNO. However, they actually
encourage you to jailbreak/unlock your AT&T iPhone on their website.