How can I get data from the /dev/ttyS0 port on the SIM7600E-H Rpi 4 model when the internet is on?

Question

When I want to receive data via GPS, the /dev/ttyS0 serial port is busy and I cannot receive data. I cannot make calls or SMS. I can receive GPS data when the internet is turned off.

I would like your support on this issue.

There is no problem with permissions. The problem is that I cannot communicate with GPS and the internet at the same time.