Why is a second sim not visible?

[KM2612]

Ok SO I have a Lumia 730 and past few days, I have been facing this problem. My Primary Sim card isn't supported on my phone anymore all of a sudden. No Matter which Sim card slot I put it into, it keeps showing "No Sim Card". I have tried a different Sim Card for same Provider, that too gives same error. Is there a way that the connection profile got deleted from "Cellular+Sim"?

I have now flashed the phone using the phone recovery tool but still the same problem. Please help. Immediately. Any ideas and suggestions will be tested right away.

 

[her3814]

I believe that this is a hardware problem take it to your nearest support center