Notice that the model with CDMA support also supports TD-SCDMA, while the model that lacks CDMA does not.
In the United States, the phones sold through Apple's iPhone Upgrade Program, which allows the user flexibility in choosing carriers, will use the Qualcomm modem in order to allow for broader compatibility.
I do believe that the follow-on modem, which The Oregonian revealed to be named the XMM 7560 when it wrote about a leaked memo from an Intel executive, may offer CDMA support.
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