Calls not received. Texts delayed.

[justinleon2113]

Hello. Just upgraded to the ZenFone 6 (Edition 30) over the new year and notice that many calls from family and friends are going straight to voicemail. I tested this with a friend in the room, and out of 5 attempts, only 3 made the phone ring. Many important calls for business do not ring at all. I am using Ultra Mobile (T-Mobile MVNO) and have done the usual run-around (reset phone, empty cache, check all settings for fowarding, DND, and such). Even on a fresh install, it is experiencing the same phenomenon. I tried a different phone and it seemed to consistently work...I'll keep testing.
I wanted to see if anyone else had issues with not getting calls or texts (irrespective of carrier) or if it could be just carrier issues for me. I have great coverage in my area, thus it is not like I am roaming or disconnected. Thank you for the help.

[justinleon2113]

petteyg359

Just went ahead and did the "secret code" in the phone app to force-enable the menu options for WiFi calling, and set it to the option that prefers the mobile network over Wi-Fi. Have had no problem receiving calls while Wi-Fi is on since.

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On T-Mobile? I tried it again after the new update (2003.144) and there's no change for me. I can turn on the setting but it doesn't do anything.

[skylerwolfe]

justinleon2113

https://zentalk.asus.com/en/discussion/comment/69280#Comment_69280

On T-Mobile? I tried it again after the new update (2003.144) and there's no change for me. I can turn on the setting but it doesn't do anything.

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I think the theory he is working with (correct me if I am wrong) is that he wonders if even though wifi calling doesn't work with tmobile, maybe it is somehow interfering with calls/texts coming through sometimes, do he changed the setting for wifi calling to "call over mobile network" instead of "call over wifi" so that hopefully it wouldn't interfere. I would think just turning it off would "work" too, if this even does have anything to do with it.

[LP_ASUS]

petteyg359

Just went ahead and did the "secret code" in the phone app to force-enable the menu options for WiFi calling, and set it to the option that prefers the mobile network over Wi-Fi. Have had no problem receiving calls while Wi-Fi is on since.

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If that is the case, we would like to log your phone for more information. I'll send you a PM.

[petteyg359]

Despite the menu disappearing after reboot until the code is entered again, the actual settings for Wi-Fi calling seem to be preserved. Since entering that code, even after rebooting, VoIP calls are coming in fine.

[Wreid23]

LP_ASUS

https://zentalk.asus.com/en/discussion/comment/69280#Comment_69280

If that is the case, we would like to log your phone for more information. I'll send you a PM.

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If you need more users to test on this fix also works rooted and there's quite a few users running it atm only change is a different mbn in this thread in xda:
xda-developers> ASUS ROG Phone II >ASUS ROG Phone II Guides, News, & Discussion > [Guide] Enabling VoLTE/VoWiFi v2 by HomerSp
I can provide my log as well if needed as I am also running the tweak.