Should you connect USIM_GND to GND?

[Aung_Khant]

Hello,

I am developing my own custom PCB using BC95-G Module.

Currently, the module cannot detect the SIM Card.

After sending 1.8V and 3.3V pulses, USIM_VDD goes back to 0V.

I used the schematics provided in the hardware design guideline as shown in the figure.

The only difference is that I connected system GND to USIM_GND.

My question is,

Is this the reason why the module can’t detect the SIM Card?

[herbert.pan-Q]

Or you can solder the SIM card holder directly to the PIN pin of the module,then try it again