Problem connecting to Pixhawk through SIK radio connected to Android phone


I would like to use my phone, instead of notebook, to connect to Pixhawk flight controller. I connect it to Sik radio. While Pixhawk connects through the Sik radio, when I am using notebook with QGroundControl, it doesn’t when I am using the phone, running Android (bought in the summer of 2020).

The green light is on on both radios…

What can be the problem?

Thanks for help.