Do you know that your new Sprint or Verizon iPhone 4S are already unlocked for GSM network? That means you can simply purchase a local sim card when travel oversea and save hundreds of dollars on the roaming fees. Sprint will sell iPhone 4S with micro-SIM slot unlocked. However, for Verizon Wireless customers you will have to wait 60 days to request “International unlock” provided that your account is good standing.
AT&T customers, sorry, your brand new iPhone 4S is not unlocked – you are still forced to pay AT&T’s roaming charges. So rather than paying for international roaming Sprint and Verizon iPhone 4S customers traveling internationally can take advantage of the new unlocked feature and get dramatically cheaper rate with a pre-paid micro-SIM card for data and voice calling. Apple store sells unlocked iPhone 4 for $649 while Verizon Wireless and Sprint offer iPhone 4S 16GB at $199. So price is huge advantage too. The only downside is that you will be using a local number instead of the one in the U.S. Make sure to let your family and friends know about the new number.