Can you use iPhone 4 sim card in iPhone JB 3GS

Discussion in 'Jailbreaks and iOS Hacks' started by mjaco002, Jun 24, 2010.

  1. mjaco002 macrumors member

    Feb 13, 2009
    I was able to jailbreak my iPhone 3GS and it works perfectly fine.

    I also have a iPhone 4 that I activated.

    I want to how I can use the iPhone 4 micro sim card in my JB iPhone 3GS.

    I did get the mirco-sim to sim adapter but when i put the thing in my iPhone 3GS it doesn't give me any connection.

    Can you help??
  2. himni macrumors regular

    Sep 24, 2009
    The sim should work did you try restarting? After I took the sim out of my iPhone 4 and put it back it took a couple minutes before it registered a signal.
  3. mjaco002 thread starter macrumors member

    Feb 13, 2009
    I restarted...i reset the settings. I tried the sim in my wife's phone as well. It worked in her's but i think it was because it was unlocked before.

    Do i have to unlock my 3gs?
  4. mallom macrumors regular

    Jun 21, 2010
    Yes. I'm using right now. I'm not using my Iphone 4 untill I receive the cases I bought. Another reason that I will be using my 3GS is because Im driving to florida next week and I need TOMTOM and tethering (PDANET only).

  5. mjaco002 thread starter macrumors member

    Feb 13, 2009

    I will just unlock the phone and hope everything works...:D
  6. OceanView macrumors 65816

    Sep 16, 2005
    I don't think you have to unlock an AT&T phone to use on their own network do you?
  7. jlmitnick macrumors regular

    Sep 22, 2009
    Not normally, but for iPhones you do... Kinda silly. Kinda defeats the purpose of a sim card in the first place if they don't even normally let you freely transfer among iPhones on their own network!
  8. mteahan macrumors newbie

    Sep 5, 2007
    What about cloning the sim?

    If I clone the micro sim card and keep my 3gs for things like tethering and Mywi, I assume I can use both phones so long as only one is on at one time.

    Is there something wrong with this logic?
  9. Pheelyx macrumors regular


    Oct 22, 2007
    Brookland, AR
    I would love to know if this would work too. Wanna clone my sim to use in my old 3g. Already have the micro-sim adapter. But would be nice to not have to swap sims every time I want to tether with MyWi.
  10. deenybird macrumors regular

    Jul 21, 2008
    Precisely. I'm waiting to know as well.
  11. mjaco002 thread starter macrumors member

    Feb 13, 2009
    Here is a link on how to clone a sim card.

    Somebody should try it and tell us if this works.
  12. himni macrumors regular

    Sep 24, 2009
    Modern sims can't be cloned except perhaps by the service provider. Sims issued after 2002 are called V2 cards and have lots of encryption.
  13. steezy1337 macrumors 6502

    Dec 29, 2008
    Carlisle, UK
    does anyone know if this is the same for UK networks? i'm with Vodafone with a 3gs and might be swapping for my mums iphone 4 which is also on vodafone so long as i can get them both to work which i haven't completely worked out yet, any help is greatly appreciated.

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