5 Replies Latest reply: Jun 20, 2009 8:13 AM by MickeyRB
JBerlinsky Level 1 Level 1
I was using the data connection yesterday, then all of a sudden, it stopped working. I tried to connect through Mail.app, Safari.app, etc., to no avail. I have rebooted the phone numerous times, toggled Airplane Mode, toggled 3g/Edge, to no avail. I tried resetting Network Settings, All Settings, and All Settings & Content, also to no avail. Not even a firmware restore would fix the problem. Any time I try to use the data connection, I get "Could not activate cellular data network." I have called AT&T, who are reasonably sure it's not a problem on their end and that it's a device issue. Any thoughts?

iPhone 3G, Other OS
  • Tamara Level 6 Level 6
    My first guess would be either a SIM problem or an outage in your area or ATT accidentally disabled data on your account.
  • JBerlinsky Level 1 Level 1
    If only it were that simple...

    I am traveling with my father, who also has an iPhone 3G. I switched the SIM cards and tried it out: his device, with my SIM, still gets data, whereas my device (formatted with the new firmware) with his SIM does not.

    I called AT&T, who said everything looked peachy on their end.
  • Tamara Level 6 Level 6
    In that case, it sounds like a hardware problem with the phone which Apple can take care of. You can either make an appointment at the Genius Bar - http://apple.com/retail/geniusbar or call 800-my-iphone.
  • csupinski Level 1 Level 1
    What version of the OS are you using? If you upgraded to beta iPhone OS 3.0 than your kind of stuck with it. The beta OS upgrades the baseband of your phone (that's the data part of your phone) and once upgraded it's impossible to downgrade it.

    Did you try to put the iPhone into DFU mode before you restored it?

    1. Make sure your iPhone is off.
    2. Plug your iPhone into your computer.
    3. Press the on/off and the home buttons at the same time (very important)
    4. Wait 10 seconds and then release the on/off button and wait until your
    computer prompts you that your iPhone is in recovery mode.
    5. Restore your iPhone with the latest iPhone OS

    I hope that helps but if not you may want to stop by an Apple store.
  • MickeyRB Level 1 Level 1
    If the iPhone message after OS3.0 upgrade is: "Could not activate cellular data network. You are not subscribed to a cellular data service." You MUST call AT&T or alternately you can use Internet Chat and must change your data profile. The issue is that AT&T has tightened the rules used during iPhone 3G/3GS (re)activation to enforce that the iPhone MUST be associated with an iPhone data profile... previously iPhones using OS2.2x could have a PDA plan or an iPhone plan. Now if you are a SIM swapper and one of the devices is an iPhone 3G/S, your profile must reflect the iPhone plan as the profile for the AT&T network. This new behavior is known to AT&T, reference M&P document: myceqp_isp150123 dated 2009-06-11.