Dual Sim not working

[bomdx77]

Dual Sim not always active in my s23 ultra.im using one e Sim and one physical sim. Its always going to updating and I'm missing calls .

[Rahul_Radhakrishnan]

This happens because of the way Samsung handles Dual SIM Dual Standby (DSDS):

On your S23 Ultra, both SIMs (physical + eSIM) stay on standby, but only one line can be actively used for data/calls at a time.

When the phone is switching networks, updating carrier settings, or using data on one SIM, the other line may temporarily go inactive — that’s why you miss calls.

It’s not a defect; it’s how dual-SIM works on most Galaxy devices.

What you can do:

1. Check SIM Manager → Settings > Connections > SIM Manager → confirm both lines are enabled.

2. Turn on Dual SIM Always On (if your carrier supports VoLTE/VoNR on both lines):

Go to Settings > Connections > SIM Manager > Call & text on other devices or “Dual SIM Always On.”

This allows call forwarding between your numbers so you don’t miss calls when one line is busy.

3. Keep software updated → Settings > Software update > Download and install. Samsung pushes patches for eSIM stability.

4. Restart after updates — sometimes eSIM profiles refresh incorrectly until a restart.

5. Contact your carriers → Some carriers don’t fully support Dual SIM Always On with eSIM + physical SIM. They may need to enable call forwarding on their side.

[Samsung_specialist]

We're sorry to hear about your experience.

To assist you further, follow these steps:
1. Check SIM Manager : Settings > Connections > SIM Manager → confirm both lines are enabled.
2. Turn on Dual SIM Always On.
3. software updated : Settings > Software update > Download and install. Samsung pushes patches for eSIM stability.

If the issue persists, please visit a service center for further assistance. You can locate your nearest service center using the link below: https://www.samsung.com/ae/support/service-center/.

[sunzfold]

I am writing to report an issue with my Samsung Galaxy Z Fold 5. The “Dual SIM Always On” feature is not working properly on my device.

Whenever I try to enable this feature, the system buffers for around 10 seconds and then displays a message stating:
“Couldn't turn on Dual SIM Always On.”

I have tried restarting the phone, updating the software, and checking both SIM cards, but the issue still persists. This feature is very important for my daily communication, and I kindly request your assistance to resolve this problem at the earliest.

Please advise me on the next steps for troubleshooting or repair.