You are just incorrect. My iPhone 6 bought from Verizon has been on ATT, T-Mobile, and spring with no issue. You're statement is only true on much older iPhone.It's the radio inside..check the model number of the phone
They are unlocked..just won't work
Verizon uses cdma..att gsm..you need a global phone that does both
http://www.cnet.com/news/switching-carriers-you-may-be-able-to-take-your-iphone-5s-with-you/
I wont dispute that. I am saying the Verizon Iphone has the required hardware built in. It is usable on ATT frequencies. They are not blocked on the iphone 5 up to the current 6s models.
I was under the impression that you were saying that it would not.
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