1. pilot2fly's Avatar
    Hi guys,

    Just purchased a brand new AT&T LG V20 phone. It was network unlocked by the previous owner and that's the only time they used the phone before selling it. I am an AT&T user so I figured the phone would still work fine for me.

    Upon getting the phone, signal in my house has become extremely spotty. With my old Galaxy S6 I always had at least two bars of signal and always had 4G LTE.

    Sometimes it will be connected to the AT&T network and sometimes you won't see the AT&T letters listed at the top left of the phone, but youll have 2 bars of signal. When this happens and I try to check my e-mail or use data, I get a message saying Network Unavailable. The phone often seems to change towers and sometimes will display the AT&T letters at the top left of the screen and sometimes won't. When it doesn't it says Network Unknown. I am using my old sim card from my Galaxy S6. It's a two year old sim card. I contacted AT&T about the issue and they are sending me a brand new SIM card for the phone. I just have to activate it upon arrival by calling them.

    I've checked APN settings and they are still set properly for the AT&T network. I've tried a factory reset, turning airplane mode on and off, and even signal booster apps. Nothing has worked. I've attached photos of some of the settings of my phone as well.

    Has anyone else experienced this issue and found a fix?
    Attached Thumbnails LG V20 network connection issues-screenshot_2017-09-19-15-23-01.jpg   LG V20 network connection issues-screenshot_2017-09-19-15-37-57.jpg   LG V20 network connection issues-screenshot_2017-09-19-15-38-01.jpg   LG V20 network connection issues-screenshot_2017-09-19-15-46-42.jpg  
    09-19-2017 03:47 PM
  2. Rukbat's Avatar
    If the new SIM doesn't fix it, you can reflash the stock ROM (see [Samsung] How to flash Stock ROM via ODIN). If you don't want to risk that (it's not really risky - it's just boring), ask at your local AT&T corporate store where the nearest Device Support Center is (it might even be in that store). Ask at the DSC if they could please flash the stock ROM for you. (I know they can, the question is whether they will - most will, some won't.) If that still doesn't fix it, you bought a phone with bad radios or a partly-disconnected antenna. (BTW, the APN only comes into play to connect to the internet, not to connect to the network.)
    09-20-2017 11:01 AM
  3. GSDer's Avatar
    you can reflash the stock ROM (see [Samsung] How to flash Stock ROM via ODIN).
    Did I miss something? I thought the OP was talking about the LG V20. What good is Odin? That's for Samsung devices.
    09-21-2017 12:43 AM
  4. tallmat's Avatar
    Come join our thread at "LG V20 Signal and connection issues". on this website domain.
    09-28-2017 07:45 AM
  5. geo77's Avatar
    hi has anyone solved the lg. v20 service issue. radio off. & please don't suggest reboot, or putting in the code that brings up test because. the device imformation option 1 says not available on this device.
    any advise would be appreciated
    06-12-2018 02:49 AM
  6. recDNA's Avatar
    Rebooting works for me. Nothing else does including turning into airplane mode and on again.
    06-14-2018 11:08 AM

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