Question Dual SIM on Android Ato - Samsung Galaxy Z Fold3

Anyone using dual SIMs on Android Auto?
I have just realized that if a contact is set to "always as SIM" then when calling this contact from AA the dealer freezes because does not know which SIM to use...

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[Q] What does Dual Sim do?

The dual-sim version of S4 mini takes 2 SIM cards. I get that. But how does this work?
Do I need to turn off/turn on the phone to switch from one sim to another, or does it provide full (or limited) functionality of both SIMs and the same time?
they work on dual sim standby I think that's the correct name,
you can use only one sim for data plan (3g) you get to choose which one to use
wen you are on a call the other sim is turned off or you can configure call redirection to the active sim but your telephone company have to be compatible
Sent from my GT-I9192 using Tapatalk 4

Issues with sim2 on s HTC one M8 dual sim

Hello
I hope this is the right place to ask and I feel at this point I have been searching Google dry over the past week.
I have a HTC one m8 with dual SIM, as I live in Sweden and work in Denmark, I have a Swedish tre.se in SIM1 and then a Danish 3.dk in SIM2
While I'm in Denmark, both SIM card works and connects to their network, but the second I enter Sweden, SIM2 won't find a connection.
I tried to switch the two cards, but then it's just the Swedish card in SIM2 that won't connect.
From what I have been able to Google , SIM2 should only be using 2g network, but this should be a problem for either of the subscriptions as far as I know.
Is there some special trick, setting or some I need to do to make it connect to 2g
It is original OS on it. I unfortunately can't root it, as my company mail will detect it and block my access. (Worx home by Citrix + touchdown)
What I have tested so far:
Factory reset of the phone.
New SIM card for both cards.
Activate and deactivate flight mode.
Deactivate and activate each SIM from the dual SIM manager.
Switch cards in slots (1->2 and 2->1).
Disable SIM1 ( SIM 2 still didn't connect)
I have also contacted each phone company, but they were to no use and just said it should work hehe
Any suggestions or ideas ? I'm open to all suggestions that doesn't involve getting another phone
Also this is not one of the cheap Chinese dual SIM versions.
Thanks
I may have managed to get a little closer to the cause.
It seems that SIM2 is actually only running over GSM / 2G for god knows what reason, and that is not supported by my phone company i Sweden, which is why it only works in Denmark.
I will try with another phone company called TDC and see if they have the same issues over there or else its bye bye useless dual sim

Dual Sim issue

Hi
I have an issue with my dual sim S9. Sim one is on Three UK and sim two is Vodafone UK. " Dual sim always on " is enabled but when I'm connected on a call the other sim card will not accept incoming calls. The sim I'm connected to for the call will show via call waiting if another incoming call is waiting but only for that sim card. It effectively means that the other sim is offline until I end my call. Being my first dual sim phone I thought I'd be able to be notified about incoming calls on both sim cards at the same time (if I'm on sim1 and a call comes in on sim2 for example)?
The other issue I have is that the Three sim is personal and the Vodafone sim is work. When dual sim is enabled it automatically forwards calls from sim1 to sims2 and vice versa when the phone is unreachable. This means personal contacts end up leaving messages on my work voicemail and work customers end up getting through to my personal sim. (I'm also assuming my network will be charging me to forward calls to the other network)
If this is how it works then I'll have to go back to two phones as I can't mix personal and work calls like that.
Thanks.
Me also i go this problem.. This is a very FAKE DUal SIM ! it does not receive all on both sim at the same time. Huawei p20 pro receive call at the same time

Zuk Z2 Plus Dual Sim - Data during calls on second sim feature Lineage OS 17.1

Hello all. I wonder if you can give me some clarity. The Zuk Z2 Plus is a Dual Sim Dual Standy phone. So my understanding after reading up on it is that only one sim can actually be active at any given moment when in use. So I have Sim 2 setup as my mobile data LTE connection and my Sim 1 is not being used for data.
Lineage OS has a feature where when I go into Sim 1 settings, it has a option "Data During Calls". Volte does not work on my phone, so that means when I get a call on Sim 2, the signal drops to 3G mode and data dies. But seeing that on Dual Standy phones when you are on a call on the one sim, the other one is also inactive because the phone only has one transceiver, the "Data During Calls" on Sim 1 wont work either, correct?

Question Possible bug F3 dual sim with VoLTE

Poco F3
12.5.1 official stable
A bug or as intended?
Dual SIM, using one SIM for calls, the second for mobile internet. Different networks. Both networks support VoLTE, it is turned on and works fine while using same SIM for calls and LTE at the same time..
But hhen calling from the first SIM, don't have LTE connection on the second.
I understand the reason is maybe because they are on different networks, but I was still expecting otherwise.
An option "use secondary SIM for mobile data during calls" does not have any effect.
CAn someone recreate?
It's dual stand-by not dual active. In dual stand-by only 1 SIM can be fully active at a time.
That is 1 SIM can have an active call and Data, or one active call or Active Data. You can't have 2 active calls on different SIMs or 1 active call and active data on different SIMs.
Update: Adding link : https://en.wikipedia.org/wiki/Dual_SIM#Standby
Oh. Thanks for this.

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