How to re-initialize sim card?

durbz · Sep 27, 2020

I have an external sim tray hooked up to my phone. When I swap the sim card in the external tray with a new one, it will not work/be recognized, unless I reboot the phone, or open and close the phone's sim tray.

Is there a way I could force the sim card to re-initialize without a phone reboot, or opening the sim tray?

mikedt · Sep 27, 2020

Try toggling flight mode off and on. That might re-initialise the SIM.

durbz · Sep 27, 2020

Thanks for the suggestion, I have tried that, but it doesn't work on the phone model I am using (huawei p smart)

lunatic59 · Sep 27, 2020

How was the sd card formatted? If it's FAT32, it should just mount right away.

durbz · Sep 27, 2020

lunatic59 said:
How was the sd card formatted? If it's FAT32, it should just mount right away.

Sim card, not SD card.

lunatic59 · Sep 27, 2020

Ooops ... sorry, I wasn't paying attention. My wife must have been talking. :eek:

External sim tray? How does it connect? Via the sim slot or USB port?

durbz · Sep 27, 2020

it is a ribbon cable, one end of it has a sim tray, the other end has the sim-card contacts, which slot in to the phone's sim tray like a normal sim would.

lunatic59 · Sep 27, 2020

Okay, after a little research, I found that while many of the newer flagships do support SIM hot-swapping, some do not. As a matter of fact, the exact quote from the Huawei support site states "Some phone models do not support the hot swapping of SIM cards. In this case, restart your phone for the SIM card to be detected and identified." So, if your model doesn't specifically say it supports hot-swapping sims, then I'd have to assume it doesn't.

durbz · Sep 27, 2020

hmm, I can just eject the sim tray slightly and push it back in to re-initialize the sim card though. I am left wondering how that works. And if that counts as "hot-swappng"

lunatic59 · Sep 27, 2020

Well, if that's the case, then I'd say your external sim reader is not just an extension but requires a driver to be reloaded to re-read the sim card.

durbz · Sep 27, 2020

lunatic59 said:
Well, if that's the case, then I'd say your external sim reader is not just an extension but requires a driver to be reloaded to re-read the sim card.

I am fairly certain it is just an extension. I don't see any electronic chips on it.

lunatic59 · Sep 27, 2020

Have you tried removing the reader and then reinserting it after you've swapped sims?

durbz · Sep 27, 2020

lunatic59 said:
Have you tried removing the reader and then reinserting it after you've swapped sims?

To do that, I would have to open the phone's sim tray. The extension isnt made in a way that it can be disconnected without physically taking it out of the phone.
This is what it looks like incase you are wondering. https://canary.contestimg.wish.com/api/webimage/5c3da3d92e4f5b0271ffe478-1-large.jpg

svim · Sep 27, 2020

OK, photo is revealing. That's a third party (Gold Finger) dual-SIM adapter, not necessarily an 'external' device, it might simply be a matter of the phone just doesn't support that particular adapter device. Is there an app that corresponds with it, presumably to add device driver/firmware support?
Is the already existing Huawei SIM tray in your phone a single-SIM or dual-SIM tray?

durbz · Sep 27, 2020

Yes, it is meant to go in the 2nd sim/micro-sd card hybrid slot, in order to allow you to use a second sim at the same time as a micro-sd card. I understood that when I bought it.
Dont think my phone supports dual sim, I wanted to just use it as a way to swap sims without opening the sim tray. I want to make something which allows me to easily swap between a lot of sims quickly.
No firmware mentioned on the product page.

How to re-initialize sim card?

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