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How do I know if a iPhone 4s is Unlocked?

I'm buying a unlocked iPhone 4s from craigslist tomorrow. I just need to know how I can verify if it is unlocked. I have an old AT&T sim card I used to use for my iPhone 4. Not sure if that would work.


I just want to make sure it isn't sprint, or verizon with a bad ESN or something. I just want to make sure I can use the phone.

iMac, iOS 5.1

Posted on May 5, 2012 7:22 PM

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4 replies

May 8, 2012 9:06 PM in response to kevinfrombronx

If it is a true factory unlocked phone then the model number will be one of the following:

MD234LL/A 16GB Black

MD237LL/A 16GB White

MD241LL/A 32GB Black

MD244LL/A 32GB White

MD2257LL/A 64GB Black

MD260LL/A 64GB White


If it is a phone that was purchased locked to a carrier and then officially unlocked the only way to tell is to do a factory restore in iTunes and see if it displays the "This iPhone is unlocked" message afterwards.

How do I know if a iPhone 4s is Unlocked?

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