Unlocking Japanese iPhone 4 (4.2.1)

Discussion in 'Jailbreaks and iOS Hacks' started by sekaijin, Jan 27, 2011.

  1. sekaijin macrumors newbie

    Joined:
    Jan 27, 2011
    #1
    Hello all, long time reader first time poster here.

    I have just been sent back to the US from Japan, and only 2 months after having purchased a shiny new iPhone 4 in Japan.

    I am now trying to get the phone to work in the US, but I have been unable to figure out what to do and some stores I have visited in NYC have also been unable to provide help.

    The J iPhone is also locked to a provider, which means I need to unlock the phone to use it with a US SIM.

    Details on my phone are as follows:
    iPhone 4
    Firmware 4.2.1
    Baseband 03.10.01

    Can anyone tell me if this phone can be downgraded or otherwise jailbroken/unlocked?
     
  2. winterny macrumors 6502

    Joined:
    Jul 5, 2010
    #2
    Tethered Jailbreak: yes [you will need to have a computer to boot up your iPhone]
    Untethered Jailbreak: no
    Unlock: no

    In the future new hacks may be released that improve things.
     
  3. oakie macrumors 6502

    oakie

    Joined:
    Oct 16, 2008
    Location:
    seattle
    #3
    contact softbank and see if they'll be willing to unlock it for you considering your move back to the US. i had no problems with them doing that for me, but i did it before i left japan when i went in to settle up the contract in full.
     
  4. labman macrumors 604

    labman

    Joined:
    Jun 9, 2009
    Location:
    Mich near Detroit
    #4
    either see if you can get them to unlock it in Japan, or sell it then buy one when you back to the US. less headaches in the long run. ;)
     
  5. sekaijin thread starter macrumors newbie

    Joined:
    Jan 27, 2011
    #5
    Unfortunately I did not have Softbank unlock the phone when I cancelled my contract. I asked the person at the counter to do so but was told that was impossible...

    I just tried a tethered JB with redsn0w, and an unlock with ultrasn0w. It appears to have worked properly, but I suppose the jury is out until I can get a SIM card from AT&T or T-mobile and test it.

    I figure that I may as well post as this may help others in similar situations.
     
  6. CZK macrumors 6502a

    Joined:
    Oct 25, 2010
    #6
    Ahhhh the famous japanese 03.10.01 baseband ... You should have said it before!!!!!!
     

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