Fairphone 5 – SIM-Card not working

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Since today my Fairphone 5 (18 months old) does not detect my SIM card (I do not have e-SIM). I have tried another SIM card of another provider, which did not work too. However, my SIM card works perfectly fine in an iPhone.

I already did all troubleshooting points such as turn off/on, clean it, service menu, set back network settings etc.

Could anyone help?