Meg,
I have an unlocked GSM iPhone 5s from Apple and have used both T-Mobile and AT&T SIMs. My question above, directed to you, was trying to understand whether or not the Verizon 5s CDMA-version is more flexible in the U.S.. From your answer, it sounds as though you really aren't sure.
Is there anyone who can address my question above (April 12, 12:07 p.m. timestamp)? It sounds to me as though there is a lot of confusion about Verizon's 5s, in terms of how the GSM side works in the U.S. and whether it will work with AT&T and T-Mobile SIMs (as well as with other, smaller carriers). Also, whether the GSM side will work without any action or permission from Verizon, in the U.S..
Again, I'm not asking to be argumentative, I'm just trying to clarify for myself and others.
Thanks,
Dan