Issue with eSIM on nRF9151 Board

[Rahul Chavda]

Dear nrf team,

We are facing an issue with the eSIM on our nRF9151 board. The SIM 1.8V pin on the nRF9151 is not supplying 1.8V. We have checked this using a multimeter.

We tried using the commands AT+CFUN=0, AT+CFUN=1, and other AT commands, but the eSIM is still not working. We are using a Twilio MFF2 eSIM.

For testing, we used two nRF9151 boards. On both boards, we soldered and tested an ST4 eSIM, which worked properly. However, after soldering the Twilio eSIM on one board, it is not working and is not being detected.

We have verified the soldering and pin connections, but the problem remains. Could you please provide us with a proper solution to this issue?

Best regards,
Rahul Chavda

[Hakon]

Based on the log file it looks like SoftSIM is selected to be used (IUICC_PROXY traces). For eSIM the selection should be SIM slot 0.

Use the command “AT%CSUS=0” to make sure that correct SIM interface is selected, and “AT+CFUN=0“ after that to make sure that it is stored to flash memory. Otherwise the old setting may be restored after power on reset.

[Rahul Chavda]

Thank you for your support.

Based on your guidance, we used the following commands:

AT%CSUS=0
AT+CFUN=0

After applying these commands, the SIM interface was correctly selected, and now the eSIM is working properly.

The issue has been resolved.