Dual-SIM: No mobile data when calling - OnePlus 6T Questions & Answers

Hello!
So I've received my second SIM with unlimited data some days ago.
I've noticed that I can't use data (from SIM 2) while being in a call on my main SIM 1.
So both SIMs (Main: Vodafone Germany; Secondary: o2 Germany) have VoLTE activated and working. I get the VoLTE 1|2 icon in my status bar when activating the dual-4G option. SIM 2 is set as standard for data - SIM 1 ist standard for all the other stuff.
Why do i have no internet-connection while being in a Call? Using only 1 SIM everything works just fine: I can be in a call and use data simultaneously.
Even if i set SIM X as standard for both calls and data everything works. Sadly it seems like i can not use data from SIM 2 while being in a call with SIM 1.
Thanks in advance!

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Hey there
I have the following situation and basically this is the reason why I've bought a dual SIM
SIM 1 - Vodafone Italy
SIM 2 - Yallo Switzerland
SIM 1 is used ONLY for receiving phone calls and I want to have it 24/7
SIM 2 is more a working SIM, I am using it for phone and internet
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First problem when I try to "disable" SIM 2 I got the message that the SIM is set as primary (whatever it means) so I cannot disable it (why ????????????)
Trying to findo out what is the reason I have discovered that if I select data on SIM 1, then I can switch off SIM 2 (whaaaaat ?????)
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Hi All!
I own a Lenovo K6 Power as you can already tell,
in which the Data functions were working without any issues.
A few months back I started using 2 sims instead of 1. Since one carrier had faster internet and better connectivity than the 1st.
Still using the 1st SIM for calling and 2nd SIM for data. Occasionally I would switch to the 1st SIM for data when my data pack was over for the 2nd SIM etc...
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Reset ur phone.
Is there any other option?
Apart from this...
I don't want to lose my data.....
What if that doesn't solve the problem...

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Basically, I'm grandfathered in on a great plan with only a gig of data. I'm also grandfathered in with another company for unlimited data, no voice service.
Is it possible to use one sim for calling and the other for data. And when I get into areas not covered by the unlimited data sim switch over to the first sim with better coverage?
Thanks for any advice.
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I used my Vodafone sim for data and everything else goes through my EE sim.
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