Is it possible to plug many SIM cards into one smartphone (android) via USB (OTG is available)?

Question

Telephony

And so that the phone can switch on the fly
. Well, I think it’s a matter of time to switch, in extreme cases, you can solder garbage that changes contacts and solder / write a “reloader” of the phone itself or whatever you need.
But is it possible at all via USB, OTG, somehow to stick a lot of SIM cards into 1 phone without designing this phone from scratch, which of course I could (I would order a board, I would burn everything with a hair dryer without any problems, the touchscreen display - yes I would take it somewhere, only it takes a long time and is by no means cheap)

Answer 1

I suppose it would be easier to make a printed connector in the form of a SIM card of the appropriate form factor, bring a short cable from it to a mechanical multi-position switch with many contact groups according to the number of contacts on a SIM card (6 or 8) and hook SIM cards to the corresponding positions. Only the device will have to be turned off before switching. Alternatives need to be explored; maybe it will be possible to implement something via USB-COM.
Here are some details: https://habrahabr.ru/company/beeline/blog/133388/