iPhone 4S can reportedly be unlocked without any hardware or software changes
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Insert original carrier AT&T SIM card
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Dial 611 for AT&T customer service hotline and drop the call
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Turn on Airplane Mode
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Take out AT&T SIM card
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Insert T-Mobile SIM card
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Update: the unlock also works with the iPhone 3GS and iPhone 4, and will need to be done again if you reset your device. Continue after the break..
My name is Matt and I am a Product Manager specializing in Mobile at Thomson Reuters. I like my Family. I like Apple. I like Photography. I like Mobile Toys. I like Food. I like Golf. I'm big into all technology with major interests in mobile which fascinates the begeebees out of me. I like a lot of stuff so I thought I'd share along with the occasional light-bulb of insight too. All views expressed are mine alone.
