Disabling one of two SIMs possible?

Help Fairphone 3
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Hello,
long time no see. :wink:
A friend has a FP3 with Lineage OS without Google (just like me) and uses two SIM cards.
One is her private SIM, the other is for work. She’d like to disable the work SIM when she’s not working, but Lineage OS says that to do that, she has to take out the card.

So first question: Is that a feature missing in Lineage OS, in Android in general or a Fairphone thing?

And second: Is there a way to add that feature? Like with an app with root privileges or anything like that?
I couldn’t find anything on the internet, which baffles me, because that’s such a useful feature, that I’m sure many people want and there just have to be solutions.

I’m happy about any ideas.

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Internet says Android in general - AOSP … https://www.reddit.com/r/LineageOS/comments/i2u573/comment/g071jtf

Is there a network setting for the SIM that the network can’t handle and thus disconnects the SIM? … https://www.reddit.com/r/LineageOS/comments/i2u573/comment/i32qq0s/

And the opening post there mentions Tasker … https://tasker.joaoapps.com/

On a side note, I found this interesting …

"So a little explanation. No modem out there effectively disables the SIM when asked to. They just fake the requests from/to it. The SIM is still fully functional.
The same thing happens in airplane mode, while you might think the SIM is disabled, it isn’t.
So Google decided instead of continuing lying to the users, to tell them to do the only real thing."

(https://www.reddit.com/r/LineageOS/comments/i2u573/comment/g073330/)

Doesn’t take away from the convenience to be able to shut up a SIM via a button, but … interesting.

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That setting disappeared a long time ago and for some time on my FP2 (dont remember on the FP3). On my FP4 with FPOS Android 13 its available (again).

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Thanks.

I don’t know about a network the SIM can’t handle but I think I found a solution inspired by your tips:

  • Go to Settings > Network & Internet > SIM 2 > Access Point Names
  • There click on the + symbol to add a new apn.
  • Name the new apn “disable SIM” and write something bogus like “0” in the apn field

Now you can “disable” the SIM in the Access Point Name settings. I think… Tbh I only tested internet by now, not calls and texts.

PS: And probably with tasker or some app like that you can create a toggle in the quick settings in the pulldown menu, to quickly switch APNs.

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I just change the ringtone volume to zero. I still can see who has been calling and listen to voicemail if I want to.

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