mate 9 dialer cannot use phone card when volte is turned on - Huawei Mate 9 Questions & Answers

This is very strange bug:
If you turn on Tmobile volte, dial:
1800-123-4567;xxxxx
where 1800-123-4567 is phone card number, ";" is hard pause, xxxxx is the pin number. Mate 9 dialer cannot send correct DMTF dial tune of pin. But when you turn off volte, everything is normal.

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P20 call barring (block all incomming calls) can't be turned off

I set to block all incoming calls in Call barring and now if try to turn it off I can't. I input code 0000 and the slider shows that it is off but if I go out from this menue and go back it it is on again. I tried with #330*0000# but I got error invalid MMI code.. What to do?
I inserted SIM in to another phone and there disable call barring and it worked...

Selecting SIM before placing a call

Hi all, just got this phone. Previously on my MI 8 I was able to long press a number and then select a sim to place the call. That doesn't seem to work as the pop up menu that shows on long press does not have this option.
I've already set a SIM for a particular number but no matter whether I dial from Favorites or from Recents it still ignores that setting. Any idea how I can dial a specific number from the non-default calling SIM? Thanks.
Works with MIUI 12 so you probably have to wait for an update.

Dual Sim Incoming calls problem on POCOPHONE F2 PRO

Hello, I have a Poco F2 PRO (8GB-256GB, MIUI 12), when I insert two SIM cards and turn on the cellphone, and I call to SIM 1 the cellphone ring and receive the call, but if I call to sim 2, the cellphone doesn't receive the call and sends to voice operator. If I restart POCO and call to SIM 2 the cellphone ring and receive the call, but if I call to SIM 1, the cellphone doesen't receive the call and sends to voice operator. But if I use just one SIM it works prefectly.
It is worth mentioning that I can make calls from both SIMs without problems, the problem is only with incoming calls.
I hope you can give me a solution. Thanks in advance.
I had same problem with my POCO F2 PRO too, but mine is worst. If i activate the SIM 2, then a few moment later SIM 1 will deactivated itself. So both SIM will deactivated itself. It only works with SIM 1. Is there any developer here would be able to help us?
Call bug
Same problem

Dual Sim: Calls on Sim2 don`t show up

I have a very specific and very annoying problem:
Incoming calls on my SIM in Slot 2 don`t show up. Only upon the end of the call I get a notification of the missed call.
Incoming calls on SIM in Slot 1 work just fine.
Problem persists when changing SIM cards, Slot 2 wont show incoming calls. All notifications are turned on. Sometimes it rings, but shows no call - so no possibility to pick up.
Problem is solved when I delete the cache of the Telephone App, but reappear after a few days.
Any ideas what could cause this problem and how to get rid of it?
Device:
XIAOMI REdmi Note 9 Pro; MIUI 12.4.3; Android 11 RKQ1.200826.002
App:
Phone by Google 72.1.414558115

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