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]

Hello,

can you please provide application log and modem trace?

[Rahul Chavda]

Hello,

We are testing after desoldering the eSIM and following the same steps, but neither the eSIM nor the physical SIM is working. We are not able to measure 1.8V on the SIM interface.

For your reference, we have attached a video showing the issue.

We also tested the following AT commands, but none of them worked:

AT+CPIN? → failed: +CME ERROR AT+CIMI → failed: +CME ERROR: 13 AT%XICCID → failed: +CME ERROR: 0 AT+CPINR="..." → failed: +CME ERROR: 0

Additionally, we tried:

AT+CFUN=0 AT+CFUN=1

but we did not observe any voltage spike on the SIM interface.

Kindly check the attached video and advise us on how to resolve this issue.

Thanks and regards,
Rahul chavda