One regular SIM plus an eSIM (which you can have many installed, but only one active at a time). I also believe some Asian markets actually have dual SIM slots

One regular SIM plus an eSIM (which you can have many installed, but only one active at a time). I also believe some Asian markets actually have dual SIM slots. I saw a YouTube video where they swapped the little daughter board with the sim reader on it from a dual SIM iPhone into a US iPhone and it worked without issues. I currently have dual networks setup (SIM+eSIM) and it works great. I think the battery life is slightly reduced, but that might be in my mind.