Bought mine at http://www.geveypro.com/shop/products/GPP-SIM-Untethered-iPhone-4S-Unlocker.html and got it today. 100% confirmed working.
Does anyone know if these work with new updates? I sent an email to the store to find out.
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