Previous 1 2 Next 21 Replies Latest reply: Jul 23, 2014 10:26 AM by HDDRS
kelseyc Level 1 Level 1
I just got my iPhone 4 this past weekend, and now the 3G internet is not working.
The wi-fi works fine and I have full reception.
Anyone know why this is happening?

I'm on Rogers.

iPhone 4, iPhone OS 3.1.3
  • tomerrof Level 1 Level 1
    I have a problem that's more or less like yours. I hope someone could help us both with the 3G internet.
    While I make calls the 3G sign is disappearing and when I'm trying to Surf the web I get the message: A data connection cannot be established since a call is currently active"
    after I finish the call, the "o" sign is returning, after few seconds it's becoming "E" and after that to "3G".
    I really hope you can help to figure this out..
  • GZukes Level 4 Level 4
    If you have Verizon, you can't talk and use the internet at the same time.
  • tomerrof Level 1 Level 1
    I'm not form the U.S so it's not the problem.. any other idea maybe?
  • GZukes Level 4 Level 4
    Have you tried reseting your iPhone by holding the sleep/wake button at the top right of the iPhone and the home button at the bottom center of the face at the same time? Hold them both until you see the screen go black and the white Apple logo appear.
  • tomerrof Level 1 Level 1
    Thanks for your help.
    Yes, I've tried it.
    Usually it happens while in the middle of the call ( the 3G sign disappears) and when I try to surf the web I get the message : "A data connection cannot be established since a call is currently active"
    Any other advice?
  • johndhynes Level 1 Level 1
    This just happened to me. I have an AT&T iPhone 4 on 4.3.1. I was on hold with my cable company while waiting for my wife at the dentist, so I tried to use Safari and got the message, "A data connection cannot be established since a call is currently active.". I noticed that the "3G" indicator was missing, although I had full bars. I might as well be using Verizon! My contract's almost up anyway...
  • patricia117 Level 1 Level 1

    Thanks to GZukes for the tip regarding resetting my iphone by holding sleep/wake button and the home button - it worked!!!! I have been trying for hours to find this info. Thanks to kelseyc for putting out the question. This discussion board is a great resource.

  • JimHdk Level 7 Level 7

    patricia117 wrote:


    Thanks to GZukes for the tip regarding resetting my iphone by holding sleep/wake button and the home button - it worked!!!! I have been trying for hours to find this info.

    Another great resource is the iPhone User Guide (which describes the reset method as a troubleshooting technique by the way - see Appendix B). This manual is available at

  • spud3 Level 1 Level 1

    My Iphone 4 is also having the same problem and i am from the UK. when the phone is reset the 3g is on but after using the wifi for a long period of time the 3g just disappears. then the wifi is turned off there is no 3g and there is no way to reconnect it. it says in the settings that the cellular data is turned on. this problem has only happen in the recent weeks, when apple updated the phones iOS. Apple need to sort this out ASAP, as its annoying that i have to reset the phone to get a 3g connection

  • hj.b Level 1 Level 1



    I was having the same problems. My iPhone 4 didn't connect to the internet via 3G, WiFi worked fine. In order to find out if the problem was caused by my iPhone or by my SIM card, I cross-changed the SIM cards of my wife's iPhone with mine. Both phones turned out to work fine with the SIM cards exchanged. After changing the SIM cards back, I tried connecting the iPhone to my Mac and syncing it with iTunes, resetting it by holding the wake and home button and resetting the cellular data network settings by pressing "Reset Settings". None of this worked.


    What fixed the problem for me finally was this:

    In the cellular data network setting pane, instead of just pressing "Reset Settings", I deliberately changed the settings I found by adding some nonsense to most of the fields. After that I pressed "Reset Settings", the original settings were re-entered and the internet connection via 3G started working again. This behavior seems kind of strange but apearently, if the original settings haven't been changed, a resset doesn't really re-enter anything... So if you try this, make sure to screw up your entries before you press the reset button.


    Hope this helps.

  • Mystequa92 Level 1 Level 1

    Thank you so much. I had this problem and resetting my phone didnt work. But I did what you did and its working perfectly. Thanks a million

  • alton_dalton Level 1 Level 1


    I find your solution very interesting, but one thing bothers me: where I can find place for changing settings which you mentioned? When I go to Network>Options are only on/off 3G/Cellular Data/Data Roaming/Personal Hotspot/VPN/Wi-Fi, on the other hand, on Settings>Reset, I have only options to reset: All Settings, Erase All Content and Settings, Reset Network Settings (Reset or Cancel), R. Keyboard Dictionary, R. Home Screen Layout, R. Location Warnings.

    So, please, where I can do what you did?


  • hj.b Level 1 Level 1



    I'm amazed and pleased that my little hint is actually used by people. Apparently this problem is not a rare one...


    Anyway, you will find the mentioned settings under:

    Settings > General > Network > Cellular Data Network


    On my iPhone, the item "Cellular Data Network" is located between "Cellular Data (on/off)" and "Data Roaming (on/off)". Please note, that I am running the latest iOS-Version (5.1.1). Maybe this item sits elsewhere in earlier versions?


    Hope it helps.

  • alton_dalton Level 1 Level 1

    Thanks for quick reply,

    Its wierd, but I haven't that option under Network, only: 3G (on/off), Cellular Data (on/off), Data roaming (on/off), Personal Hot spot (settings), VPN (settings) and Wi-Fi.

    I have iPhone 4, 32GB, T-Mobile, Croatia.

    Anyhow, problem solved with complete restoring (without backup! with backup didn't work) on factory settings.

    Then everything pull back with iTunes and PC (for iOS apps which have PC support, no jailbreak).

    Thanks again!

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