1 Reply Latest reply: Jun 22, 2013 6:59 AM by braden85
Appleuser1949 Level 1 Level 1

I have an IPhone 4 with IOS 5.1.1 (and have no desire to go to IOS 6; 5.1.1 has been working well for almost a year) I suddenly have a message 'Network connection failed', 'No cellular data connection- check settings' etc. Nothing downloads after I leave home...calls, voicemails, texts are fine (Sprint) Really frustrating! Cannot upgrade to IOS 6 due to lack of storage space but that isn't a problem- don't want IOS 6. I have 2 GBs left but 21 GBs left in ICloud.

iPhone 4, iOS 5
  • braden85 Community Specialists Community Specialists

    Hi Appleuser1949!


    I have an article here that will give you some steps to troubleshoot this issue with your cellular data connection. That article can be found right here:


    iPhone: Troubleshooting a cellular data connection



    And I have echoed those steps right here:

    Follow the instructions below for assistance with troubleshooting cellular data issues on your iPhone. After performing each step, please test to see if the issue is resolved.

    1. Toggle airplane mode: Tap Settings, turn airplane mode on, wait three seconds, and then turn off again.
    2. Restart your iPhone.
    3. Ensure that your software is up to date:
    4. Remove the SIM Card and reinsert it. Allow the iPhone to acquire the network again.
    5. If your SIM card has SIM PIN enabled, try toggling it off: Tap Settings > Phone > SIM PIN.
    6. Try another location. If a different location works, but the original location still does not, contact your carrier to report the issue.
    7. Reset network settings: Tap Settings > General > Reset > Reset Network Settings.
    8. Restore the iPhone as new.
    9. Contact your carrier to:
      • Verify that the iPhone is properly set up on the account with the appropriate, current data plan.
      • Verify that there are no account-related blocks.
      • Find out if there are specific error messages in the carrier logs that could help determine why the issue is occurring.

    If none of the above steps resolves the issue, contact your carrier, make an appointment at an Apple Retail Store, orcontact AppleCare to troubleshoot further.

    Thanks for being a part of the Apple Support Communities!