Cannot get VoLTE working in any ROM :( - Xiaomi Redmi 4X Questions & Answers

Hi,
I cannot get VoLTE working in any ROM. It did not work in RR, it did not work in Havoc, it did not work in Stock MIUI and it does not work in LineageOS. So probably not the ROM is the fault.
Further Information:
Redmi 4X Global 3/32 GB
LineageOS 16.0-20201007-NIGHTLY-santoni (but did not work with other ROMs either)
German Klarmobil SIM (Telekom)
VoLTE with the same SIM works out of the box in my father's Redmi 6A
VoLTE is enabled in settings
Baseband: MPSS.TA.2.3.c1-00395-8953_GEN_PACK-1_V048

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Hello,
I have a Mi 8 in Germany with Vodafone but the LTE+ does not work.
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Did you check your APN ?
you can find it under settings>mobile network>APN (Access Point Names)
and choose for live.Vodafone or the carrier you have.
Yes the LTE works but not the LTE+. In the APN are web.vodafone.de active.
Mi8 doesn't have B7+B3 aggregation so sometimes in certain areas LTE is really slow
Ok but my Mi 8 never use LTE+ only LTE
1990marcow1990 said:
Hello,
I have a Mi 8 in Germany with Vodafone but the LTE+ does not work.
LTE works but very slow.
I have root and the Global MIUI 10 installed.
Can I go to Havoc OS to make it work?
Can I flash only Havoc OS and Google over the Global MIUI 10.0.2.2?
Click to expand...
Click to collapse
It's only supported if you purchased Vodafone Red S, M, L or XL
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