SIM data transfer protocol

Hi all,

we have having problem reading the Verizon SIM card. We have captured the data transfer from the SIM card when we insert it but we like to understand the data that is transferred. Anyone has the protocol spec for SIM data exchange when the SIM card is inserted?

We are using the EM7455 module.

What is your problem?
modem is not accessing the SIM?
Maybe you have some SIM communication/electrical issue, I’d rather debug the HW lines than SW.


Thank you for your reply. It turned out to be a hardware issue and has been resolved.