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This will only work on a 4S that was provisioned for a GSM network. Like AT&T etc. the Verizon and sprint versions (even though they have a gsm radio and sim slot) will not be unlocked or activated with this sim unlock.

Am I correct in this statement?

I hope so cuz I gave up trying to use a sprint 4s with my att sim. As it was said it wasn't possible.
 
works only with at&t phones. I got mine in the mail today and it works 🙂 $20 on ebay. bummer there isn't a way to preserve baseband for 4s yet
 
works only with at&t phones. I got mine in the mail today and it works 🙂 $20 on ebay. bummer there isn't a way to preserve baseband for 4s yet

I think it works with all GSM iPhone 4S, not just AT&T locked units. For other carriers, you need to 'program' the GPP.
 
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