yashsingh1/xdaforums huggingface dataset:
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] Ermann123:
todays ROM update is resulting in reboot to recovery over and over again. last weeks rom is working fine,.

edit: SOLVED: device was just out of storage memory :D
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] norman0:
I had no problems with the update today.
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] YozoraS:
Has anyone tried to install this (or any other) custom rom on a unlocked Docomo (carrier in Japan) device (SO-05K)? I've bought one which the seller promised that it has bootlocker unlocked, but have no idea whether it could install custom roms like global XZ1 or XZ1c I've used before.
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] kurtn:
Installed lineage4microG. April update works fine. Thanks for the stable official basis.
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] ben_2777:
Hi guys,

Maybe my question was not relevant. H8314 is H8314. I have bought it. I will just use "Newflasher" to put last european ROM from "Eisberg". Then we will see for LOS20.0
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] hack1jack:
The same
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] dtrunk90:
Issue is known and since QPR2 merge. No logcat required.
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] dtrunk90:
Make sure it's not an issue related to magisk, any installed magisk modules or other addons. With only LOS+MindTheGapps+ih8sn the update worked fine on my daily driver.
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] dtrunk90:
Only global models are supported. Check the LOS wiki device page for a list of supported models.
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] ben_2777:
No mods, no magiks, no root, no gapps. Clean flash on 20.0 update. I also get some touch panel freeze sometimes, I have to push power button to get it back working.
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] Ermann123:
SOLVED: device was just out of storage memory :D
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] DrTrax:
@dtrunk90 Magisk Hide Props have a MEMORY LEAK issue, since I removed it, my device have up to 1.7GB free RAM and so far NO slowdown...

Of course, SafetyNet got triggered BUT I found a updated/modded version of Universal SafetyNet Fix by Display

https://github.com/Displax/safetynet-fix

This fixxed my SafetyNet test AND my XZ2C is much smoother!

Worth to take a closer look, I think ;)
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] moto4user:
qq regarding the double tap wake up option in LOS 13 microg (April 2023):

"Tap to check phone" is searchable and SHOULD appear in "Gestures" and "Lock screen" settings, but when I go there, the option is missing. Does someone have idea why?

The same LOS build with another Sony device (5 II) works fine.
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] dtrunk90:
DT2W is not supported and the microg build is not the official LOS build, so no support here.
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] dtrunk90:
Good to know. I'm going to remove the magisk option anyway since ih8sn works fine and should be used instead.
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] Giacomo411:
Hi @dtrunk90,

thank you for your work. I am using this Rom for some days now and it seems all great.

I have two problems:

1) After disabling and enabling the airplane mode, it ask for the SIM pin. I don't know if is an already reported issue. I only found a similar problem in an issue on the gitlab project of lineageos for another version in another device

2) I have a very specific problem with two apps who requires the nfc. In Italy there is an authentication method who requires to scan your ID card with your phone. The card need to be near your phone for about less than 30 seconds. I tried many times and the process always fails. It seems like the process stops or restart after a couple of seconds.

Tell me if you can do or need anything, like a log or a video of the issue happening
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] dtrunk90:
1) That's not an issue

2) Does other NFC stuff work or did you bought a japanese model?
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] Giacomo411:
I don't have a japanese model. I tried reading and writing from an nfc tag and using the nfc on some bluetooth headphones for the "one-touch connection" and I didn't have any problem.
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] dtrunk90:
Maybe it's an unsupported tag by the nfc driver. A log would be helpful.
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] Giacomo411:
Here is the logcat. I tried with the nfc scan like 6-7 times.
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] dtrunk90:
Is your phone rooted so you could try something? Just add ISO_DEP_MAX_TRANSCEIVE=0xFEFF to libnfc-nci.conf, reboot and check if it makes any difference. Also some additional Tag info would be helpful. There are nfc apps on the play store telling which Tags are used (MiFare for example).
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] Giacomo411:
I have a rooted device. I tried adding ISO_DEP_MAX_TRANSCEIVE and redone the log file for both the cases, with or without the edit, and there is no difference. I also tried using the conf file from the aosp project at https://github.com/sonyxperiadev/device-sony-apollo/blob/ebd777c945158c7d0ea09de46d3479ba073916c2/rootdir/vendor/etc/libnfc-nxp.conf but there was no difference in the log messages.

In all the last log files I have the same error

04-20 22:41:19.802 W/CryptoUpcalls(11137): Exception while decrypting message with RSA private key using RSA/ECB/PKCS1Padding:
04-20 22:41:19.802 W/CryptoUpcalls(11137): java.lang.ArrayIndexOutOfBoundsException: length=0; index=0
04-20 22:41:19.802 W/CryptoUpcalls(11137): at it.ipzs.cieidsdk.nfc.Ias.respSM(Ias.kt:1523)
04-20 22:41:19.802 W/CryptoUpcalls(11137): at it.ipzs.cieidsdk.nfc.Ias.getRespSM(Ias.kt:1630)
04-20 22:41:19.802 W/CryptoUpcalls(11137): at it.ipzs.cieidsdk.nfc.Ias.sendApduSM(Ias.kt:1364)
04-20 22:41:19.802 W/CryptoUpcalls(11137): at it.ipzs.cieidsdk.nfc.Ias.sign(Ias.kt:638)
04-20 22:41:19.802 W/CryptoUpcalls(11137): at it.ipzs.cieidsdk.ciekeystore.Cipher.engineDoFinal(Cipher.kt:29)

You can find it in line 2234 of the attached log file. I tried to scan the nfc tag 3 times and for every time there is the same error. The app is open source and the reference is in this link https://github.com/italia/cieid-and...rc/main/java/it/ipzs/cieidsdk/nfc/Ias.kt#L640

Reading in the issues in the repository, the problem can be that the security channel between the phone and the card closes too soon. Obviously, everything was working correctly with the stock Rom.

I am also trying to build and run the app, to attach a debugger, but with poor results.

Also, as requested, there is an image of the card nfc details
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] umr1935:
How can I fix the Gapps, it always shows no connection, I am using MindTheGapps-13.0.0-arm64-20230408_162909 with los20 on XZ2
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] smanet:
Hi Giacomo, what is the application? Maybe I can try it too.
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] smanet:
sorry for a little OT - I'm trying to get the ih8sn installaed, I could make if for my A1 (LOS 19.1) via Magisk , but I can't get it to work here (patched boot.img doesn't boot, thanks for helping me with the slot_a/b magics!) .

Could you point me a link to a guide or something?

@umr1935 , I had the same strange issue. While tinkering, LOS update+factory reset resolved it. It seems a DNS related problem, since LOS update is downloading/installing normally.
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] Giacomo411:
Hi, the two apps are:

Io https://play.google.com/store/apps/details?id=it.pagopa.io.app

CieID https://play.google.com/store/apps/details?id=it.ipzs.cieid

I have a problem when doing the authentication with the ID card, when you have to leave the card attached to your phone.

They both use https://github.com/italia/cieid-android-sdk to manage the nfc authentication
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] ben_2777:
Hi,

Since today update"20-20230505...". I had an issue with "Schema". All "schema points" just disappear; lucky me my hand knows exactly what schema to do, to unlock phone.

It happens just after update+reboot. I switch OFF/Switch ON. I got "point of schema" back in the screen. But 2x times randomly it happened again today "no point on schema" to unlock screen. I did not change any setting .

No mods; No roots; No gapps. (simple clean flash 100% as tutorial); No strange apps for battery saving. Anyone had the same issue?
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] GT500s:
What is the maximum SD card for XZ2 Compact? I'm using Samsung Evo 256GB but was wondering if 512GB will work.
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] Ermann123:
Even 1 TB is working :)
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] mongo0:
Hello,

Anyone else having wifi issues with the duo / dual sim variant of xz2c? Same build on standard variant runs fine. I'm building for myself but there should not be any difference.

android.hardware.wifi@1.0-service: Failed to write driver state control param: Invalid argument
06-04 16:01:21.617 1080 1080 E android.hardware.wifi@1.0-service: Failed to load WiFi driver
06-04 16:01:21.617 1080 1080 E android.hardware.wifi@1.0-service: Failed to initialize firmware mode controller
06-04 16:01:21.618 1080 1080 E android.hardware.wifi@1.0-service: Wifi HAL start failed
06-04 16:01:21.619 1720 2103 E HalDevMgr: Cannot start IWifi: 9 ()
06-04 16:01:21.619 1720 2103 E WifiVendorHal: Failed to start vendor HAL
06-04 16:01:21.619 1720 2103 E WifiNative: Failed to start vendor HAL
06-04 16:01:21.619 1720 2103 E WifiNative: Failed to start Hal

Tested with official LineageOS (lineage-20.0-20230602-nightly-xz2c-signed.zip), same problems (wifi, bluetooth not working, probably more).
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] PerfectJam:
Hello,

Currently running Lineage 20.0 on my Sony XZ2 Compact, I want downgrade to Lineage 18.0. Since I'm on L20, the phone looks like super slow and not fluid as before.

Where can I find the old L18 ROM and the boot image ? From what I understand, I need the correct boot version to install the ROM right ?

Thanks for the help !
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] dtrunk90:
https://xdaforums.com/t/rom-11-lineageos-18-1-official.4195805/post-87549605
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] norman0:
It is implemented in LINEAGE-20.0-20230616-NIGHTLY-XZ2C-SIGNED.ZIP.
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] dtrunk90:
Yes. And we're finally able to use 19MP with Aperture after Google fixed the CameraX library.
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] norman0:
Yes, now 19MP are used. Good version, perfect.
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] Mintoll98:
Maybe who knows what kind of audio device is there and if it is separate from the firmware that can be installed on another phone
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] norman0:
Hi all, since the last update, the need for root has disappeared for me. Charging Control now replaces acc. That was the last Magisk module I needed. For hiding root, I have so far used Zygisk and the Safetynet fix.

So I uninstalled Magisk via the app and flashed ih8sn via recovery. I changed the ih8sn.conf beforehand as described. But unfortunately my banking app and the MyT app now tell me that my smartphone is rooted. What am I doing wrong?

Thank you and best regards
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] norman0:
It's strange that the YASNAC app doesn't show any problems after I installed ih8sn.

What does Magisk / Zygisk / Safetynet fix do differently?
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] DrTrax:
YASNAC only checks the basics.... not what some other developers do to detect "unwanted modifications"....

Here some of my solutions;

1. Check whether Magisk was uninstalled properly (Root check app, uninstalled with Magisk or just app deleted? Restored STOCK boot.img?)

2. Some apps refuse to work on custom ROM so.... out of luck...

3. Sometimes, Zygisk change the behavior of an app and after uninstalling it, the app might realize it has been bamboozeld the whole time... reinstalling might help... worst case, a clean flash of the ROM is required...
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] norman0:
Hi DrTrax, thank you for your answer.

I restored boot.img and then uninstalled magisk. I did this within the APP. Root check App says, ther is no root.

maybe this is the problem.

reinstallation of the app does not help

So I'll stay at magisk
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] mirhl:
Mhh, I don't know what's more peculiar.

That while akari should share the same exact hardware, their configuration slightly differs.

Or that until like a year ago (including in the stock rom) all the tama boards were using the PN544 driver instead of PN553.

EDIT: see also https://github.com/sonyxperiadev/device-sony-tama/commit/706ea89616e62f1ca44e6b097441c72da644161c
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] flopticalcube:
Hi, I am replacing an old Moto E4 on Android 7.1 for a family member with an XZ2 Compact H8314 with Android 10. They are not an advanced user, their needs are straightforward. Should I leave stock 10 or upgrade to LOS 20 to avoid any problems over the next few years regarding app compatibility? Really don't need any features of the most recent OS but want to avoid problems with compatibility which I have noticed in their 7.1 phone and having up-to-date security patches would be a bonus.
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] kurtn:
If it's not for removing Google apps, i think it's better to stay with original firmware. The security patches are paid with an open boitloader.
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] zpunout:
If choosing to unlock the bootloader, remember to backup the DRM keys on the TA partition first. They might be useful one day, maybe. If you don't, the unique DRM keys for your phone are forever lost. (Having said this, AFAIK there hasn't yet been a way discovered to restore backed up DRM keys for XZ2 anyway.)

I chose LineageOS because I didn't want Google system apps running on my phone and collecting data.
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] flopticalcube:
Thanks, I will leave them on A 10 until there is an issue in the future (assuming the phone lasts).
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] ben_2777:
Hi everyone,

I just got H8324 (dual SIM), H8314 is working like a charm by the way. I just unlocked bootloader with IMEI number. Before I go further I am questionning myself as there is 2x IMEI number because 2x sim slots. My question is do I have to "re generate" a new unlock code with the other IMEI number? Or it is just find as my phone completely reboot and now I have the boot message "your bootloader is unlocked".
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] dtrunk90:
There is only one bootloader. If it's unlocked, it's fine.
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] ben_2777:
Hi @dtrunk90 ,

I just followed every step carrefully( reflash stock etc..) I was at step copying "copying the contents of the active slot to the inactive slot". Once finished instead of doing "recovery reboot" I choose "Reboot now" . Device is stuck at booting with black screen and "SONY" logo. I kept push power button for 10 sec nothing happened. Do you have any advice, please?
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] dtrunk90:
To forcefully power off the phone hold volume up and Power. It will first vibrate one time and after some more seconds it will vibrate 3 times. Then you should be able to get back into recovery and continue.
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] ben_2777:
just managed to do it my own, by testing, but thank you so much for prompt reply!
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] norman0:
Are there problems with the bluetooth-tethering? It hasn't worked for me since a few versions. I can switch it on in the settings, but when I exit the settings and go back to bluetooth-tethering, it is switched off again.
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] dtrunk90:
Not sure, never used this feature. Do you have a logcat? Maybe adb logcat *:F is enough if it's a crash.
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] norman0:
Hi, logcat *:F is empty, so there is no crash. I have a complete logcat without *:F. Can I PM it to you?
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] dtrunk90:
No need to. I can check it the next days myself. It was just my first thought there would be a crash.
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] norman0:
Thank you!
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] Zinara:
Wifi calls are no longer possible after installing LineageOS 20. This had worked without problems with Android 10 before the installation.

The IMS status with *#*#4636#*#* shows "not registered" and Voice-over-WLAN: Not available, although I am connected to a WLAN. WLAN calls are enabled in the settings.

When I try to make a call without a cellular network and with WLAN, I get the message that I should establish a WLAN connection.

How can I enable wifi calls again?
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] farfromrefuge:
I am facing some battery drain issues with my xz2 compat using that rom. It does not always happen. But sometimes (like now) the battery is getting down real fast. I have disabled all my apps and i still see a battery drain.

Dont know if anyone can help. Here is the logcat i just got (battery is draining during that time)

BTW i am on june 9 build

thanks
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] zpunout:
You might need to Zip the logcat.txt for it to upload here.
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] farfromrefuge:
Thanks just added it in zip format!
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] Mintoll98:
Can you tell me who is the maintainer of our device
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] odiad:
Hello,

since some weeks I have sometimes a non-reacting touchscreen. After press power button to switch off screen, and unlock screen again, the touchscreen works normal. It seems that falure comes randomly, and it happens more often in the last time.

I installed LOS20 clean month ago (including Magisk and Gapps), and I install sometimes the OTA updates.

All was fine for a long time, then the problem appeared. I updated now to latest LOS20 without improvement.

Has anybody same problem? Probably hardware issue, isn't it? Or is there a chance by complete new installation to solve that issue?

BR

Odiad
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] zpunout:
I used to have a phantom touch issue with LOS 18. After updating to LOS19 (then later LOS20), the phantom touch issue disappeared. I don't know if that was just a coincidence or if there were any screen calibration settings changed (if they even exist).

I don't know if the issue you have is related to what I had in some way, but maybe you could test LOS18 for a while to see if there is different behaviour. That might give clues as to whether it's a software and/or hardware issue.
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] Shujath:
I've also been experiencing the same on my xz2c.

I was thinking its due to the bad fall it had last week.

Anyone else have same issue ?
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] zpunout:
The original post in this thread is by the maintainer. (dtrunk90)
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] MacGyverNL:
I've had this issue on my stock xz2c for years, possibly even from before it was on Android 10. Touch input stops working, usually within the first 10 seconds of turning the screen on. Turning the screen off and back on restores normal operation.
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] PerfectJam:
Hello there,

Since I have L20, I have some memory leak (see pic)

Spoiler content hidden.

I read on this thread that it can come from the Magisk Hide Props (I don't know what is it, and I don't find the feature on Magisk).

I don't know how to record properly RAM usage from each app, and I only found this app (on the screenshot linked).

Do you have any idea what can be responsible of this memory leak ? or how can I manage to record more details ?

Thanks,
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] ben_2777:
Hi,

clean flash (tutorial 100% followed) stock ROM reflashed. (no mods, just recommanded gapps installed: MindTheGapps-10.0.0-arm-20220224_161620). 20-20230630-NGHTLY-xz2c

I have issue with "mobil network automatic selection". I had H8314 before never had issue, I changed to H8324. I triple checked APN everything ok, also parameter "preferred mobil network" selected GSM; WCDMA ;LTE (location france). I have "exclamation point" on the network bar and no more DATA. It is like it loose the 4G and can't downgrade to another network. Sometimes it is blocked to GSM or H+, I restart phone and get back the 4G. Also if I go to plane mode ON/OFF, the mobil network come back.

Here is logcat hope it helps.
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] zpunout:
If the logcat.txt won't upload, try putting it into a zip file first.
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] ben_2777:
Thanks, I did not checed!. I will do it as son as I am home.
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] Zinara:
I have now flashed the stock ROM to the H8324 several times. Each time I then had Wifi Call with T-mobile active with the stock ROM. After updating to LOS 20.0 according to the official instructions, Wifi Call was not functional again.

At least it should be mentioned in the installation instructions that this feature does not work. Thanks.
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] ben_2777:
Print screen is French but "WiFi appel" is activated. I have h8324.
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] Zinara:
Yes, but it is not functional.
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] kurtn:
H

That's not the recommended GApps.
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] ben_2777:
my mistake:

MindTheGapps-13.0.0-arm64-20221025_100653.zip​
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] odiad:
Hi. I just tried wifi-call. It worked. I am from Germany, my provider is Congstar (t-mobile).

Best regards

Odiad

(LOS20 +Magisk + MindTheGapps)
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] Zinara:
Interesting, thanks for the feedback! Now of course it would be interesting why it reproducibly does not work for me.

Is your model a H8324 - Dual SIM?

Did you follow the official instructions, or did you perform additional steps with root rights (Magisk)?

Can you turn off GSM, i.e. flight mode, then wifi on and then make wifi call? I mean, do you really have such bad GSM reception that you can't make calls over it so that Wifi Call becomes active?

Do you have a Wifi Call icon, or do you only see that you are calling over Wifi when you make a call?

Thanks a lot!
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] ben_2777:
Just to let you know. there was a setting "in grey" could not change before "automatically change network: deactivated". Yesterday I saw it with the possibility to change it (no more in grey). Now it is activated. Let's see if it does something.
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] odiad:
Hi,

I have H8324 (Dual Sim), but I am using only one SIM. I just tried: In flight mode it doesn't work. If I switched on WLAN call then this seems to be the prefered mothod for call. So if the phone is - next to normal connection to provider - connected to Wifi then on caller-screen is shown Wifi-call. So expecting that this information is correct the call runs over wifi. But no opportunity to use it without an established LTE/GSM-connection.
[Sony Xperia XZ2 Compact ROMs, Kernels, Recoveries,] ben_2777:
I went back to stock, network algorithm is "unstable" for H8324.