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The only problem with software unlocks are that they require a Jailbreak and are only supported on a limited number of older baseband versions.
Another method of unlocking an i Phone involves purchasing some sort of passthrough card or SIM interposer.
The price of one of these cards is anywhere from – .
If you happen to be in possession of an older i Phone with one of the compatible baseband versions shown below however, you can indeed unlock it for free.When you purchase one of these special passthrough cards you will be required to place it between your SIM card and the baseband hardware (it essentially sits on top of your SIM card).In order to maintain this sort of unlock you must always keep the card between your SIM card and baseband hardware.The two software unlocking solutions for the i Phone that are currently available are Ultra Sn0w and Black Sn0w.Ultra Sn0w was developed by a group of developers by the name of the i Phone Dev-Team, where Black Sn0w was developed by an individual by the name of Geohot.