ThinkPad released in 2011. This version of the T420 is thicker then the T420s and lacks motherboard level USB 3.0 hardware. The T420i is very similar, but not quite the same.

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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

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Hi!

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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Comments:

The SIM card slot on the T420 is in the battery bay, but the WWAN card is located by the bottom RAM module. That's the WiFi card.

T420 RAM

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