Fairphone 5 dual sim question

[yvmuell]

You might want to read this although about the FP4

Physically add second sim

So I’ve been looking into modifying the fp4 and I found that the physical wiring is there for a second Sim slot. So is there a way to solderer on a second slot and make it work? I know that there might be software lacking but since the physical part is there couldn’t we use a custom OS and add the software? I have education in electrical and software engineering so I know generally how these things work but I’m still new to smartphones so I could be missing something. Thanks for any help [I…