1. Calvin22's Avatar
    VoLTE had been working fine on my unlocked Verizon S9 on Trafone (Verizon network) since I did a factory reset and clean install of the latest Android 9 firmware in Dec. 2019 using Odin.

    Now VoLTE seems to still be enabled, but it always uses 1xRTT instead of VoLTE since I upgraded to Android 10
    (May 6, 2020 Service Update 19 firmware.)

    Texting “APN” to 611611 didn’t seem to do anything. I had to manually create APN settings, but 4GLTE data seems be working fine now.

    I tried resetting network settings to fix VoLTE, but that didn’t help.

    Under Settings -> Connections -> Mobile Networks, the “VoLTE calls” feature is visible, and it is enabled (“Use LTE data networks for calls whenever possible”) which seems OK.

    Under “SIM card status”, “Mobile data network type” is LTE.
    But “Mobile voice network type” is “1xRTT”.
    Should that say LTE too?

    Grateful for any help!
    06-08-2020 11:47 AM
  2. BergerKing's Avatar
    Saw your mistake thread, and a tip for future reference, if you have a problem with a post, simply tap the Report icon, and in the report box, just tell the mods that you need your thread moved, changed, deleted, etc. This helps keep things neat and tidy. Thanks!
    06-08-2020 01:26 PM
  3. Calvin22's Avatar
    Thank you! That's helpful. I read the help thread on deleting posts but hadn't figured out how to contact the right person yet.
    06-08-2020 02:59 PM
  4. Calvin22's Avatar
    I did not find a solution for Android 10. Since I received no replies, I’m guessing that this may not be a widespread problem. E.g. perhaps it only affects MVNOs such as Tracfone.

    Fortunately, the locked bootloader did allow me to use Odin to downgrade from the May 6, 2020 Android 10 (G960USQS7DTE1) version to the Nov 26, 2019 final Android 9 version (G960USQS7CSK5). I wish I could go back to an even older version because I used to only have half the idle battery drain last year. But the locked bootloader does not seem to permit it.

    After downgrading back to Android 9, “SIM card status -> Mobile voice network type” is now LTE instead of 1xRTT, and VoLTE works again. Hopefully there will be a solution and I will be able to upgrade again some time. Please let me know if you have any info on this problem.
    06-16-2020 08:46 AM
  5. Kizzy Catwoman's Avatar
    Glad you got it sorted
    06-16-2020 09:59 AM

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