What is an slot on a motherboard used for?

Currently the keys B, M, A and E together with B+M and A+E are in use The slot and the module have to support the same key in order to be compatible

BM 中文 · Pay Bill Top Up · U Mobile Mobile Plans Prepaid · Postpaid · U Borneo Locate the SIM slot at the bottom of the device​ ​ Step 2 Align the SIM

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