sim card interface in a phone
 

Hi,

I was asked to change the sim card slot of a phone.
By removing the old connector broken, I have ripped the track of the
"D-(USB Inter-Chip)" pin. Do you know if the phones sometimes use this
interface to communicate with the SIM card and in what circumstances? In
this case, have you got an idea of €‹€‹the type of circuit that is
connected to this pin?

thank you