Enabling 3G service on US AT&T on unlocked iphone 4

Discussion in 'Jailbreaks and iOS Hacks' started by pacnorth206, Aug 25, 2011.

  1. pacnorth206 macrumors newbie

    Joined:
    Aug 18, 2011
    #1
    Hello,

    I have an iphone 4 I bought in Japan:

    Version: 4.3.3 (8J2)
    Firmware: 04.10.1

    I signed up for an AT&T account (with data plan) and got a sim card. Next, I bought a Gevey Ultra, cut my sim and did the manual unlock (dialing 112). It worked like a charm and now I can send texts and get AT&T signal, but without 3G.

    I input the following entries into Settings>General>Network>Cellular Data Network>Cellular Data

    APN: wap.cingular
    User Name: WAP@CINGULARGPRS.COM
    PW: CINGULAR1

    I then powered off my phone and turned it back on. I went through the unlock process again (dialing 112) and the phone still shows full bars to AT&T, but without 3G.

    I called AT&T, but they told me to turn on data roaming...

    Is there a way to activate 3G service?

    Also, the profile on my phone is still listed as my Japanese carrier (and is listed as UNSIGNED). Can I remove this profile?

    Thanks for your help,
    John
     
  2. Coleman2010 macrumors 68000

    Joined:
    Oct 9, 2010
    Location:
    NYC
    #2
    I have an unlocked AT&T iPhone 4 and my settings are different and 3G works for me. They look like this:

    Ceullar Data
    ANP: phone
    Username:
    Password:

    Visual Voicemail: acds.voicemail
    Username:
    Password:

    Username and password for both are blank. I'm using a prepaid AT&T SIM with grand fathered unlimited data.
     

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