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iPhone 3GS unlocking question

iphone 3gs puretalk

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#1 RK Mar00n

RK Mar00n

    seeker of truth

  • Joined: 02-October 03
  • Location: Florida

Posted 18 July 2014 - 19:22

I have an unlocked iPhone 3GS that I’m currently using with provider PureTalk.


It is currently using iOS version 4.0. It is jailbroken and unlocked. 



I want to update the phone to version 6.1.6 but I am afraid of losing the unlock (don’t really care about the jailbreak) and I fear it would be make the phone unusable due the fact that I have a PureTalk SIM card installed and not a AT&T.  I do have a non-working AT&T sim card I can swap out but not sure if that will help or affect things. 



Can someone please help me?