1. AC Question's Avatar
    I own an GALAXY S7 EDGE AT & T ( G935A )

    Yesterday on morning i was talking on phone and after 1 minutes 17 sec phone loses carrier signal and after 2 sec of losing signal the phone reboot automatically then was very slow. I rebooted the phone, and it showed that havent SIGNAL there and instead CARRIER SIGNAL i see the circle with diagonal line there.

    I wait some minutes for the signal but again the same, i make some restarts but again the signal doesnt work, just displayed circle with diagonal line. Then i make RESET FACTORY and after configuration was the same again, i update to nougat 7.0 but again was the same error, i downgrade to ANDROID 6.0 but again doesnt work.

    The wi-fi works perfectly with no problem, but I can't make a call, send sms, or mms, or use mobile data like 2g 3g 4g lte or gsm.

    Any ideas how I can turn the radio on? I've rebooted several times and toggled the Mobile Data button, but that isn't doing anything.

    Other details are:

    In SIM CARD status:

    NETWORK: Unknown
    SIGNAL STRENGTH: -113 dBm 0 asu
    Mobile Network Type: Unknown
    Service State: RADIO OFF
    Roaming: Not roaming
    Mobile network state: Disconnected
    MY PHONE NUMBER : Unknown

    On About Phone:

    Model number: SAMSUNG-SM-G935A
    ANDROID version: 6.0.1
    ANDROID SECURITY PATCH : SEPTEMBER 1, 2016
    Baseband version: G935AUCS4API2
    Kernel version: 3.18.20-8575098 dpi@SWHC3823 #1
    Build number: MMB29N.G935AUCS4API2

    IMEI INFORMATION IS THERE, SERIAL NUMBER ALSO,
    IMS REGISTRATION STATUS : NOT REGISTERED

    CAN YOU HELP ME WHAT TO DO PLEASE ? HOW TO FIX THAT ?

    THANK YOU
    07-19-2017 05:29 PM
  2. anon(238680)'s Avatar
    Welcome to Android Central. Thank you for your very detailed post. Either your SIM card has died or you have a problem with the carrier, account or maybe they're off the air for some reason. You need to contact your carrier and discuss with them. I would guess there is nothing wrong with your phone at this point.

    If you need additional help or have more questions or details to share, please join the site so you can reply in this thread. See this link for instructions on how to join Android Central.
    07-19-2017 05:37 PM
  3. tube517's Avatar
    How are you "upgrading" to Nougat and then "downgrading" to Marshmallow?
    07-19-2017 05:56 PM
  4. Enea Xh's Avatar
    @PJRed2008 im registered now Thank you
    Isnt my SIM Problem, because i have check this SIM in another mobile and works perfectly, also i insert another SIM card on these mobile phone and doesnt work.

    @tube517 through ODIN
    07-19-2017 06:12 PM
  5. anon(238680)'s Avatar
    im registered now Thank you
    Welcome as a new member, and thank you! If the SIM is okay, the carrier is okay, then I would guess the SIM tray or some other hardware failure. That's the only thing left as you've replaced the firmware. Sorry, I've got nothin' else at this point.
    07-19-2017 06:17 PM

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