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Questions regarding flight mode/network time.

Discussion in 'Android Devices' started by krichek, Aug 27, 2010.

  1. krichek

    krichek Well-Known Member
    Thread Starter

    Nov 11, 2009
    So I've made a couple of observations that some may find curious or may not care about at all, that have lead me to some questions I'm hoping some one might be able to answer.

    If you go into settings/date and time the first option is a check box that says Automatic (use network-provided values). If you uncheck that it does not stick through a reboot. Upon restarting your phone this box will be checked once again.

    Now for the interesting part. If I put the phone into flight mode, uncheck the automatic box and then change the time and/or date. The instant I re-check automatic the time is reset correctly. How is this possible? I thought that flight mode actually turned the radio off. If it does indeed turn the radio off then how is the phone able to instantly set the time to the correct value?


  2. SamsungVibrant

    SamsungVibrant Well-Known Member

    Jul 23, 2010
    interesting question.
  3. galaxyS

    galaxyS Well-Known Member

    May 12, 2010
    umm not sure, but maybe because the phone is turned on? and when it is on then the phone recognizes the right time as the time keeps working despite having the radio off?

    like a battery powered wall clock, or a solar powered watch..

    not sure though.. LOL idk
  4. ouroboros

    ouroboros Member

    Aug 23, 2010
    New Orleans
    Yeah, I'm guessing that the phone keeps track of the last "right" time as far as the network is concerned and saves it, so that when you go back to using the network to set your phone, it goes back to the last "right" network time, regardless of whether you have network connectivity. I assume that when you turn the radio back on it goes back to keeping itself synced via the network as usual. One way to really put this to the test would be to turn off the network-provided values box, turn on flight mode, change the time, then physically change time zones, and then hit the network-provided values box again without turning flight mode off. If your phone adjusts the time *and* is able to compensate for the time zone difference, then you have something weirder going on, I think.
  5. w_bovine

    w_bovine Well-Known Member

    Jul 19, 2010
    It's possible that it simply stores the time/date information. Then again, just because all transmitting functions are disabled doesn't necessarily mean that all receiving functions are disabled as well.

    I'd definitely like to hear more about this because, as SamsungVibrant mentioned, it is an interesting question.

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