How to unlock an iPhone: Use any SIM in an iPhone 4, iPhone 4S, iPhone 5 ...

PC AdvisorHow to unlock an iPhone: Use any SIM in an iPhone 4, iPhone 4S, iPhone 5 ...PC AdvisorIf your iPhone is locked to a particular carrier, it can be truly frustrating. Some iPhones will only work with a SIM card provided to the carrier they're locked to – O2, EE or Vodafone, for example. But there are ways to unlock your iPhone 4, iPhone ...