Messed with RSim Settings and now it’s not working


Hey Guys !
I am screwed guys. I have messed with RSIM settings on my iPhone 6S and unfortunately I have changed some settings which results in losing network and the carrier is Searching…
I have resat network settings and also all settings. Finally I just deleted all my data and setting (Factory Reset my device) But I am unable to get RSim menu back.
Guys what could be wrong ?
How can I get that menu back ?
I have tried a different sim but all I can see is Carrier is Just Searching…
Please guys help me out.