Q:But i have another question… I have a Sim-Card installed and when someone is calling the number you only haer someone calling nothing on the screen. Also the other can hear what i say but i dont hear them. But the rest of the Audio is working music… everything works. How can i fix that ?

A:The 4G LTE SIM card inside the Koason android screen machine can only be used to access the internet, not to make or receive calls.