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How to make 3G sim compatible to 2G modem ?

Discussion in 'Microcontrollers, Programming and IoT' started by arvimg, Feb 14, 2017.

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  1. arvimg

    arvimg

    7
    1
    Feb 7, 2017
    How to make 3G sim compatible to 2G modem ?

    including the embedded C code
     
  2. Wilksey

    Wilksey

    11
    2
    Mar 3, 2010
    I believe, depending on the SIM provider that the SIM (as long as the voltages are correct) will work with most modems, but the modem will only negotiate at the speed it's cellular interface allows, be it 2G or 3G (or even 4G now), 3G can fall back to 2G, but 2G won't fall forward, meaning that if a SIM is 3G, it should work fine with a 2G, bit if it's a 2G only SIM (would be VERY rare these days), it probably won't work with a 3G modem.
     
  3. ramussons

    ramussons

    347
    64
    Jun 10, 2014
    As mentioned in the earlier post, there should normally be no problem for the system to fall back to 2G. But operators can lock the modem (or any other comm device) to allow it to operate only for the Network / location... etc.

    Can you be more specific? Which Modem, Which operator?
     
  4. arvimg

    arvimg

    7
    1
    Feb 7, 2017
    SIM 800 and a general 4G/3G sim
     
  5. ramussons

    ramussons

    347
    64
    Jun 10, 2014
    If the SIM is active and the Modem is OK, there should be no problem. It should work.
     
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