Sim card slot problem
My lenovo thinkpad t420 has a sim card slot under the battery but it does work
is it whether the slot is fake or there is other problems with it
Many business class laptops have SIM slots under the battery, but they only work if there's a special PCIe WWAN to connect to the carrier installed. You can check if yours has that component if you follow thisvideo and open your laptop up.
Thisis how the part looks like, if you'd like to get yourself one.
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