A wafer-thin SIM interposer card from a company called Gevey is available which purports to unlock the (AT&T model) iPhone 4 running the latest iOS 4.3 software and baseband, Gadgets DNA is reporting. The SIM, which fits alongside an actual carrier SIM card together in the tray, uses a hardware hack to make the iPhone 4 available to non-AT&T GSM carriers, and supports iOS 4.0 and up along with baseband versions 1.59 and higher.
