Does GSM transmit/keep time like CDMA does?

Discussion in 'iPhone Tips, Help and Troubleshooting' started by dxyovak, Jun 13, 2013.

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  1. dxyovak, Jun 13, 2013

    dxyovak macrumors newbie

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    #1
    CDMA transmits the time in the signal and the user never has to set the time. Does GSM do this also? Or do GSM users have to manually set the time?
     
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  2. FoxFifth, Jun 13, 2013

    FoxFifth macrumors 6502

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    #2
    I have AT&T (GSM) and never have to manually set the time.
     
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  3. dxyovak, Jun 13, 2013

    dxyovak thread starter macrumors newbie

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    #3
    great. someone told me that GSM signals do not transmit the TIME, that only CDMA networks do this. Person had a GSM nokia phone in the past and required manual time config.

    Perhaps the GSM networks updated their networks to allow TIME transmission?
     
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  4. zorinlynx, Jun 13, 2013

    zorinlynx macrumors 603

    zorinlynx

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    #4
    GSM networks have transmitted the time at LEAST since the first iPhone in 2007, which set its time just fine over the network.
     
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  5. dxyovak, Jun 13, 2013

    dxyovak thread starter macrumors newbie

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    #5
    it was a sony-ericcson phone (he can't remember model) thru ATT. It was around 2002-2003 he thinks.
     
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  6. FoxFifth, Jun 14, 2013

    FoxFifth macrumors 6502

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    #6
    I had an AT&T Nokia phone in 1999 (shortly before it became Cingular if my memory is correct) and it got the time from the network. During one switch between standard and daylight time the transmission didn't get changed for some reason -- I would manually change the phone to the new correct time and it would subsequently reset itself to the wrong time. It finally went to the correct time around midday.
     
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  7. dictoresno, Jun 14, 2013

    dictoresno macrumors 601

    dictoresno

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    #7
    When I had AT&T, carrier time was always set by the network like my Verizon does now. However I just landed in Iceland and connected to the Vodafone network here and the time never set itself properly. I had to turn on my set time zone location services in order for it to update the time. So it may depend on the carrier and not GSM networks as a whole.
     
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