Cant't detect sim card

[youngSuperman2077]

Hello,

We applied for some nrf9151 samples and designed a simple development board with reference to nrf9151 DK. However, there was an issue during testing that the SIM card could not be detected.

At present, we have determined that all physical connections are fine. The SIM card supports 1.8V

Here is our schematic:

[Asbjørn]

Hello YuYoung,

Is it possible to capture a log or trace from your device? You say that the SIM card supports 1.8V, does that mean you measure 1.8V on the SIM_VDD pin of the sim card?

Best regards

Asbjørn