Before that, the iphone users are restricted to use the specific operator who is the authorized reseller of iphone. And the unlocking solution for iphone is expensive & the phone cannot upgrade the firmware anymore after unlocked.
And now, the X-SIM , the unlocking SIM, for iphone can provide a cheap solution at only USD45.21. And there are no risk of damaging the phone, no refuse the supporting of upgrading the firmware, user-friendly way by inserting a card only.
The working theory is that there is existed of the operator identification in iphone. If the SIM card is from the authorized operator, then, the iphone would open, otherwise, the iphone would not open. And the X-SIM is for cheating the iphone saying the SIM card is from the authorized operator (in fact, not), then, the iphone would still open even the card is not from the authorized operators.
So, the phone is never really unlocked, it get “cheated” instead.
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Source: http://www.articlealley.com/article_247975_45.html
Source: http://www.articlealley.com/article_247975_45.html

