Disabling one SIM causes both SIMs to lose connectivity and requires reboot

[hattu]

REPRODUCIBILITY: Always

OS VERSION: 5.0 (build 5.0.0.76)

HARDWARE: Sony Xperia 10 III

UI LANGUAGE: English

REGRESSION: No

DESCRIPTION:

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When disabling one SIM card via Settings → SIM cards, both SIM cards temporarily lose network connectivity (including mobile data).

PRECONDITIONS:

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Two SIM cards inserted and active.

STEPS TO REPRODUCE:

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1. Insert two SIM cards

2. Go to Settings → SIM cards

3. Disable one SIM card

EXPECTED RESULT:

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Only the selected SIM card should be disabled.

The other SIM should remain connected without interruption.

ACTUAL RESULT:

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Both SIM cards lose signal temporarily.

Mobile data is also interrupted on the active SIM.

In some cases, the remaining active SIM does not reconnect automatically.

A device reboot is required before the active SIM starts working again.

MODIFICATIONS:

==============

None

ADDITIONAL INFORMATION:

=======================

This behavior is confusing from a user perspective, as the UI suggests that only one SIM is affected.
The device likely uses Dual SIM Dual Standby (DSDS), but the behavior is still unexpected from a usability perspective.
Similar issue has been reported earlier on Xperia 10 II:

10 II: Disabling SIM 1 breaks connectivity on SIM 2

REPRODUCIBILITY: 100% OS VERSION: 4.6.0.13 HARDWARE: Sony Xperia 10 II UI LANGUAGE: English REGRESSION: Unknown DESCRIPTION: In a dual-sim setup, disabling the first sim-card will break all connectivity on the second as well. The only way to get it back is to either reboot the phone, or re-enable the first sim-card, disable the second, re-enable it and then disable the first again. Then it apparantly has to search for networks from the start again. PRECONDITIONS: A dual-sim phone and two…

[nthn]

Duplicate of [Xperia 10 III] Turning off SIM 2 takes SIM 1 with it

[hattu]

Forum bot didn’t find that. Otherwise, I would have linked to it and might not have written the whole report.

[wetab73]

This is actually one of those numerous ‘evergreen’ bugs, first reported like half a decade ago (if not more) and then several more times, confirmed by Jolla guys themselves as reproducible by them, yet never fixed.

[hattu]

I only just realized that my car doesn’t recognize two SIM cards and always picks the wrong one, so I thought the problem would be solved by removing one of the SIM cards.

[Demonia]

Maybe just change the places?

[hattu]

I have tried to change places and it not help. Car want to use always wrong sim. I don’t know why. Maybe the wrong one sends stronger signal or something I don’t know.

[Demonia]

I am not useng 2 SIMs, just out of curiosity : are there some additional settings for sim cards, wath to use for the call, for SMS or for Internet? Maybe is here some workaround?

[hattu]

My solution is: Go to settngs > SIM cards > Use SIM card and choose there SIM1 or SIM 2. Then mobile network is open for both SIMs but I think I can use only the sim I have chosen to use. And not disabled for both sims. When I*m not driving I choose SIM mode to Always ask.