Cannot change APN iPhone4

Discussion in 'iPhone Tips, Help and Troubleshooting' started by TWS38, Jan 3, 2012.

  1. macrumors newbie

    Jan 8, 2011
    I believe that I was successful in jailbreaking and unlocking my iPhone4 that I used with AT&T in the US with Greenpoison. (If it is any proof, I have the ultrasnow check marked within the Cydia/Loader...this does mean it is unlocked/jailbroken, right?)

    I am currently in Japan and I entered into a voice and data contract with Docomo (a carrier that is not an official carrier of the iPhone). However, when I entered the sim, it either shows only 1 bar, No Service, or Invalid Sim.

    I was told that in the Settings-General-Network, there should be a Cellular Network (or something similar) where I can change the APN. I do not seem to have this.
    I tried going to, but Docomo in Japan was not one of the choices.
    Occasionally, within Settings, Carrier appears, but it is set on Automatic and says that it cannot show the network list.

    What is wrong? What can I do?
  2. macrumors 65816


    Nov 25, 2010
  3. thread starter macrumors newbie

    Jan 8, 2011
    What can I do?

    unlockit does not have Docomo in Japan as an option...
  4. macrumors Nehalem


    Apr 16, 2008
    At the iPhone hacks section.
    You will have to configure/install a custom apn file.
    Find out your carrier settings either by using google or calling your provider.
    Not sure if has that option.
    I thought it did.

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