Brandsmart Cell Phones Unlocked more. Use Jailbreak To Unlock Iphone. One of the promoted specifications on the new Apple iPhone 4S is the 'world phone' capability, but it isn't quite the world phone that many international travelers who use GSM phones are used too. Macworld has a your new iPhone 4S really is and as you can see it turns out the Verizon iPhone 4S may actually be the best option for international travelers. Given that I am traveling to Nokia World in London in just over a week, I just went through the entire SIM unlock process with Verizon on my new 32GB White iPhone 4S and wanted to explain the process in detail for you. Options for international usage There are two ways you can use your new iPhone 4S internationally, (1) roaming directly through your US carrier partner agreements or (2) by using an international/local microSIM card with coverage in the country you are visiting.