Verizon Apple iPhone 5S On Verizon Vs. AT&T

[cellulartalk]

I am wondering about the Verizon Apple iPhone 5S. Lets say it is activated on Verizon. If I were to insert an AT&T SIM card that has active service, does simply inserting a GSM SIM card disable the CDMA portion? I am assuming that it is NOT capable of two line simultaneous service.

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Courtesy of WestNet Wireless
www.westnet.ca