How is the SIM card interface for miniPCI-E 3g/4g modems implemented in laptops?

Question

Iron

I don’t understand how the SIM card interface is implemented in laptops when connecting miniPCI-E cellular devices? Roughly speaking, where to insert it and how do the SIM card lines reach the module / chipset of the device?
Those. for example, I want to insert a miniPCI-E card into a laptop, there is a card, there is an antenna, but there is no SIM slot. Does it not turn on? Or, for example, if a laptop has a slot for a SIM card and an internal 3g modem, and I insert a miniPCI-E LTE modem into it, will it get to the SIM card or not?

Answer 1

Without a SIM-reader soldered on the motherboard - no way.

Answer 2

There are special add-ons that look like a sim reader with output contacts on a flexible cable, they are sold on eBay for about $ 10, the output contacts cling to the miniPCI-E legs, a SIM card is inserted into the sim reader and everything works.
It will not be as convenient as with a sim card reader divorced in the case (usually a slot under the battery, so sometimes the ability to change the SIM card without removing the battery on a trip will even be a plus), but it will work.
If the sim card reader is divorced and is, then the 4G modem will also have to hook up to the sim card (there are just sim card contacts on the legs, no tricky magic).