ThinkPad released in 2011. This version of the T420 is thicker then the T420s and lacks integrated USB 3.0. The T420i is worked on the same way and uses many of the same parts, so repair is more or less similar.

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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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You do not need lenovo access communications software to run the modem card. Simply use the internet settings in windows, and double check the sim card is activated and inserted the correct way.

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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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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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