CPU load increases & phone gets hot when in airplane mode

Discussion in 'iPhone Tips, Help and Troubleshooting' started by d33p, Feb 7, 2011.

  1. d33p macrumors newbie

    Joined:
    Feb 7, 2011
    #1
    I took a 2 hour flight recently and put the phone in airplane mode.

    When I landed I noticed my phone was fairly hot, the battery had lost about 40% charge and SysStats shows a constant 80-90% CPU load even with all apps closed.

    As soon as I turned airplane mode off, CPU load dropped down to <10% and the phone cooled down.

    I then isolated the trigger to data. If I disable data (cell and wifi), the CPU load jumps right back up and stays 80-90% and the phone heats up.

    Turning data back on (either cell or wifi) causes it to return to normal.

    I've done a soft reset and a hard reset. I've terminated all the apps in the background. All to no avail.

    Any ideas?
     
  2. McGiord macrumors 601

    McGiord

    Joined:
    Oct 5, 2003
    Location:
    Dark Castle
  3. d33p thread starter macrumors newbie

    Joined:
    Feb 7, 2011
  4. d33p thread starter macrumors newbie

    Joined:
    Feb 7, 2011
    #4
    To recap :

    if I turn all data off, processor load jumps right up, phone gets hot and battery life decreases massively.

    if I turn data back on (either cell or wifi), processor load returns to normal, phone stays cool and battery lasts 24 hours.
     
  5. d33p thread starter macrumors newbie

    Joined:
    Feb 7, 2011
    #5
    Interestingly, whenever data is turned off, every time I go into my text messages I get a popup telling me to go into settings and enable data.

    Why would simple text messages need a data connection??
     

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