Why is my LG g6 h870ds not picking up the second Sim?

[Android Central Question]

My LG g6 h870ds is not recognizing the second Sim at all. Or even if there is one Sim in the phone but in the secondary slot in the tray it does not recognize it. Please help. Seems like I'm the only one who has this problem.

 

[B. Diddy]

Welcome to Android Central! You've already tried putting a SIM that works in the primary slot into the second slot? If that's the case, then the SIM reader for the second slot is probably faulty. Is the phone still under warranty?