http://appadvice.com/appnn/2011/10/surprise-cdma-iphone-4s-comes-with-an-unlocked-sim-slot The days when CDMA iPhone users were at a disadvantage when traveling internationally are long behind us. As just discovered by Macworld, the iPhone 4S is even more of a worldphone than we originally thought. According to them, not only can your Sprint or Verizon CDMA iPhone be used internationally on GSM networks, but the SIM slot that it comes with is actually unlocked, meaning you can pop in any SIM you want. Thats right, when youre traveling to other GSM countries, youll be able to buy a local micro-SIM card (or a normal one and cut it), and pop it into your iPhone 4S. While Sprint will be making this a standard, Verizon will still be locking the iPhone 4S SIM slot for new users, and will only grant what they call international unlock for folks whove been good and around for at least 60 days. The big unknown, of course, is whether you could actually pop an AT&T micro-SIM into such a device. Weve tried to find out, but havent been able to figure that out yet. If its the case, that would be a very interesting feature. After all, since youre paying for the contract, why should the carrier prevent you from doing what you want with the phone, right? But thats a whole other debate.