How to get VoLTE & VoWifi in Germany working? (Telekom/ T-Mobile) - LeEco Le Max 2 Questions & Answers

Hello everyone!,
Hopefully there is someone who knows, what i could do about this problem.
I'm not able to use VoLTE in Germany! Even T-Mobile supports it & it was shortly working on a different rom, currently it seems no where to work (IMS says "not registered")
Tried different ways to activate VoLTE first but no way.
Would be glad for any help!

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A mi me pasa igual con vodafone españa y no encuentro la manera de activarlo

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macarell_1 said:
A mi me pasa igual con vodafone españa y no encuentro la manera de activarlo
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Click to collapse
¿Por qué no podemos en España?

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A ti te funciona el volte en españa?.Si es asi podrias explicar ,ya que a mi no me funciona

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macarell_1 said:
A ti te funciona el volte en españa?.Si es asi podrias explicar ,ya que a mi no me funciona
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Click to collapse
Tampoco, no me funciona, estoy con Yoigo.

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DJ_BARO said:
Hello everyone!,
Hopefully there is someone who knows, what i could do about this problem.
I'm not able to use VoLTE in Germany! Even T-Mobile supports it & it was shortly working on a different rom, currently it seems no where to work (IMS says "not registered")
Tried different ways to activate VoLTE first but no way.
Would be glad for any help!
Click to expand...
Click to collapse
Heyyo, odds are you'll need updated APN settings. Please download this TWRP installer I made to update APN settings from Google.
https://sourceforge.net/projects/lineageos-for-x2/files/Mods and Tweaks/
Download > install via TWRP > reboot to system.
Then once in Android again? Settings > network & internet > mobile network > advanced > access point names > "..." Menu button > reset to default.
Hopefully after that? It will work. I can't guarantee though that Google APN settings already has the necessary APN settings for that network, but they should be more up to date than our current ones.

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ThE_MarD said:
Heyyo, odds are you'll need updated APN settings. Please download this TWRP installer I made to update APN settings from Google.
https://sourceforge.net/projects/lineageos-for-x2/files/Mods and Tweaks/
Download > install via TWRP > reboot to system.
Then once in Android again? Settings > network & internet > mobile network > advanced > access point names > "..." Menu button > reset to default.
Hopefully after that? It will work. I can't guarantee though that Google APN settings already has the necessary APN settings for that network, but they should be more up to date than our current ones.
Click to expand...
Click to collapse
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Good day
First of all thank you very much for your help (and to help others aswell) & should I say for your effort in developing custom roms for our beloved Le Max 2 :good:
Unfortunately VoLTE still doesn't want to work, currently sticking still with latest RR nougat from 05/10/17. But I tried some Roms in the meantime & interesting enough, on a very few (i think your LineageOS aswell) VoLTE did actually work. Maybe trying also to reset that system + that fix (I installed it in a time where i didn't have VoLTE)
Actually I'd like to update to at least Oreo too, but I heard that the sound on the phone is not supposed to be good (quiet or noisy): Is it also the case with the latest version of your Rom? That's pretty much the only reason I don't want to update. (And even with the current Rome it's pretty quiet)
Trying out a few EUI Roms in the meantime, but because of very outdated security patches & almost no substrate support it's quite a pain
EDIT: Also forget to mention: In *#*#4636#*#* Settings, VoLTE is enabled.
However, I don't expect you to be intensively involved with that, but of course if you have any more ideas, i'll appreciate that.
Since sometimes even in custom roms, where VoLTE worked at first & later on it didn't always assumpts, that the missing band 20 (which is very essential at least here in Europe, X829 version ) could also play a role in that. (LTE itself works here, where I live: But maybe VoLTE is also coupled to band 20 here.)
T-Mobile justifies it like this & can't help me futher ("Doesn't support all frequencies so...")

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I still can not turn it on after updating the apns

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Same here.
But what i would also like to mention: After flashing this Zip & reseting APN to stock values, phone calls are broken for me! (After Dialing, it immediately says "Call ended") Thankfully i did make a TWRP backup before.

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DJ_BARO said:
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Good day
First of all thank you very much for your help (and to help others aswell) & should I say for your effort in developing custom roms for our beloved Le Max 2 :good:
Unfortunately VoLTE still doesn't want to work, currently sticking still with latest RR nougat from 05/10/17. But I tried some Roms in the meantime & interesting enough, on a very few (i think your LineageOS aswell) VoLTE did actually work. Maybe trying also to reset that system + that fix (I installed it in a time where i didn't have VoLTE)
Actually I'd like to update to at least Oreo too, but I heard that the sound on the phone is not supposed to be good (quiet or noisy): Is it also the case with the latest version of your Rom? That's pretty much the only reason I don't want to update. (And even with the current Rome it's pretty quiet)
Trying out a few EUI Roms in the meantime, but because of very outdated security patches & almost no substrate support it's quite a pain
EDIT: Also forget to mention: In *#*#4636#*#* Settings, VoLTE is enabled.
However, I don't expect you to be intensively involved with that, but of course if you have any more ideas, i'll appreciate that.
Since sometimes even in custom roms, where VoLTE worked at first & later on it didn't always assumpts, that the missing band 20 (which is very essential at least here in Europe, X829 version ) could also play a role in that. (LTE itself works here, where I live: But maybe VoLTE is also coupled to band 20 here.)
T-Mobile justifies it like this & can't help me futher ("Doesn't support all frequencies so...")
Click to expand...
Click to collapse
Thank you for the kind words! Yeah on Oreo? I've made a crap load of prop changes that relate to IMS / VoLTE, so that may have been the difference.
I don't think most of them would directly translate to Nougat ROMs as they don't have the same blobs as our Oreo based ones which changed a bunch of properties to vendor... So I'm unsure exactly what on RR Nougat would need to be changed.
Audio on Oreo? I fixed Noise Cancelling / Echo a while back, so it's super good for that. I am cranking up a few more volume parts just to Max them out before potentially sound distorts heh. :good:
Sergey also had a fix for microphone source on Oreo ROMs to also improve things for those trying with a 3.5mm headset :good:
As for audio quality? On LineageOS I wouldn't get approved for Dolby Atmos, so that would require flashing audio mods (RR Nougat included the mod ViperFX Audio or something like that).
The only low audio issue that needs to be resolved is WhatsApp audio recordings as it does some odd method of selecting audio recording source... But the rest is good.
I can't test VoLTE tbh... Canadian carriers currently blacklist any BYOD... So my imported LeEco Le Max 2 doesn't get activated for VoLTE or WiFi calling sigh... As if having the most expensive mobile data plans in the world wasn't bad enough eh? So yeah, I'm not too sure what else can help...
macarell_1 said:
I still can not turn it on after updating the apns
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Click to collapse
Can you please provide which ROM you are on?
DJ_BARO said:
Same here.
But what i would also like to mention: After flashing this Zip & reseting APN to stock values, phone calls are broken for me! (After Dialing, it immediately says "Call ended") Thankfully i did make a TWRP backup before.
Click to expand...
Click to collapse
Ah for that, yeah a backup or reflash the ROM as it'll overwrite the mod. Sorry I didn't know you were running a Nougat ROM, so maybe it's not compatible with the latest APN update from Google... But it should though, as I don't think their APN list is version specific as they list it under "master" branch, but I could be wrong...

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Now with rr android 6, but we are the e tested all android 6.7.8 and 9 without any resutado and changed austes in build.prop etc etc and there is no way to make it work.Many thanks for your collaboration