Should you connect USIM_GND to GND?


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?

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