Actually, the verizon iphone has GSM capabilities, the only question is whether it will allow you to use the at&t sim card, if indeed the phone is not sim locked, it should work.
Original message:
Donald,

Unfortunately it's not possible to use a Verizon phone on the AT&T network. The two carriers use different radio technologies. Of the big four carriers Verizon and Sprint use CDMA technology for cellular service while AT&T and T-Mobile use GSM. It's not even possible to switch the phones between the two CDMA carriers.

Todd




On Thu, Sep 26, 2013 at 12:08 AM, Donald L. Roberts <donald.robert...@gmail.com <mailto:donald.robert...@gmail.com>> wrote:


An acquaintance is using an iPhone 5 on Verizon. He is considering switching to A T and T. Not sure why anyone in his right mind would want to do that. But, be that as it may, he wants to know if the iPhone 5 will work if he merely puts an A T and T nano sim in the phone; or, is it locked to Verizon in such a way that it won't work on A T and T. He is not interested in an international unlock, he merely wants to switch to A T and T. Incidentally, since the 5 came out less than a year ago, I suspect that he is still under contract to Verizon; so that may be an issue.

Thanks for any clarification on the phone's usability on A T and T.

Don Roberts

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