SIM 2 can not receive SMS when on phone using SIM 1

[Geogre]

S21 Plus

Why can I not receive an SMS on my sim2 when I am on the phone using sim1?

It never works. I have a phone bundle on sim1 but use sim2 for personal banking etc..

So when I am on the phone using sim1, they are trying to send me an sms on sim2 as that is the number that is registered to them. Makes sense?

What setting is not right or is this not possible? On my Huawei and Motorola, it was a very fluid experience.

Help.

[BPxxx]

Hiya I have a s22 ultra and have two sims which both work only issue is if I'm on sim 1 I won't get texts or calls from sim 2 come through until I end the call on the sim 1 - I've tried activating the dual sim but it won't allow me any ideas or help please

[Geogre]

Thank you everyone for responding.. Someone asked me why I need to get a Sms while on the phone and can't wait? I'm on the phone with the bank and I'm trying to log onto my bank account online and MFA kicks in and I can not get the SMS. Or the bank is telling me for further support I need my identity certified so they will send me an sms. I can't receive it while taking to them.

No help from Samsung yet?

[Geogre]

You think it is a setting I have to do?

[Shichipa]

how you set ul Both Sims to get sms on same time? Clarify how to operate the phone to get sms.

[Mohamad altamimi]

Did you found any solution?

Iam facing same problem with my s23 ultra

[andy765]

In 2022, I posted a solution for Motorola phones. I don't know whether it helps for others ... I reproduce below

***

"24-10-2022 08:09 AM

Solved (at least for Motorola)

I had the same problem when overseas :
- Bought local sim, placed in primary slot (SIM 1)
- Moved sim from back home to secondary slot (SIM 2)
- Activated data on local sim to get internet connection.
- SIM 2 SHOULD have been available still for SMS and phone calls.
BUT it wasn't.

So two-factor authentication was impossible because SMS
messages were not arriving on SIM 1.

My phone is Motorola, not Samsung.

But my solution was as follows :
- On both sims, under Settings/"Network&Internet"/SIM cards - tap on one SIM 1 / SIM 2 respectively.
For both SIMs, there are options for 'Call preference' and 'Messages preference'.
[ The default values for both had been SIM 2 (so causing SMS messages to be blocked). ]
- Change 'Call preference' and 'Messages preference' to 'Ask every time'.

Works perfectly.

Hope this helps"

[Nafooz]

I am having this same issue on my dual SIM S20.  Was there ever a solution or fix published by Samsung? Thanks

[Geogre]

Not yet. Unless something has changed..I just got used to it and will move to OnePlus 13 soon. I got tired of searching for a solution.

[LiquidSnake]

Thank you! This information provided seems limited but I recall having a previous Samsung where I was ABLE to receive texts while on call (an extremely handy feature for just getting OTP to a PAYG phone whilst calling from the one with an actual plan). However now on my S24+ it seems I have the DSDS, I wish companies were more transparent on whether their phone was DSDS or DSFA!

Is there an official way to check whether your phone is DSDS or DSFA (without doing the call shenanigans - I mean checking a website or inputting a 'special' code into the phone etc.)