Practically GPP SIM Unlock looks like this:Step One: Take off your SIM card and SIM tray Step Two: Insert custom GPP SIM interposer along with your card into the iPhone Step Three: Wait for 10-30 seconds for card to activate. You'll see carrier's name along with full signal bar Step Four: Dial any number to check the network connection and working state The unlock was released in the middle of February 2012 so official AT&T unlock wasn't available at that time. You can choose this option if you're not able or don't want to unlock iPhone 4S baseband through AT&T customer service. This unlocking option will be especially helpful if you travel outside the US, as the GPP SIM works with any SIM cards and any carriers around the world. It looks like steadily working solution without much problems. It catches up the signal once it was lost for some time, works ok after turning Airplane mode on and off etc. But from marketing point of view those features aren't new at all and it's hard to understand what's the fundamental difference between GPP SIM and Gevey Ultra S. With equal prices Gevey Ultra S unlocks 4S iPhones running iOS 5.1 while GPP SIM doesn't and the last one works only with AT&T iPhones (probably they will update the list soon). Does it work - yes, is it worth buying - not sure.
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