Mi3 No SIM card issue

[nuwanmw1988]

Hello, I was using lineage Os latest nightly when I encountered this issue. I wanted d2w. So I flashed Zurion X. Phone rebooted to TWRP. So I flashed recankut kernel. Phone worked. But I noticed that it started showing no sim card. I tried flashing Lineage Os back and nothing. So I flashed MIUI latest global beta via fast boot. No SIM card issue persists.. Now Im beginning to think that the issue is hardware issue.. I dissembled the phone.. But the sim card connectors seems to be OK for naked eye.. MY phones I will is not affected, neither the baseband.. So I'm out of options now. Can someone suggest me a workaround to bring my phone back to life.
Thanks.
Also it seems that I can make emergency calls.. Which means the radio I working

 

[nuwanmw1988]

Hello, I was using lineage Os latest nightly when I encountered this issue. I wanted d2w. So I flashed Zurion X. Phone rebooted to TWRP. So I flashed recankut kernel. Phone worked. But I noticed that it started showing no sim card. I tried flashing Lineage Os back and nothing. So I flashed MIUI latest global beta via fast boot. No SIM card issue persists.. Now Im beginning to think that the issue is hardware issue.. I dissembled the phone.. But the sim card connectors seems to be OK for naked eye.. MY phones I will is not affected, neither the baseband.. So I'm out of options now. Can someone suggest me a workaround to bring my phone back to life.
Thanks.
Also it seems that I can make emergency calls.. Which means the radio I working

It was my sim card tray.. The lower right coner of the sim tray was broken and it interfered with the sim card identification mechanism. With a new simple card tray my phone is fixed.

 

[AndreyNov]

If the SIM card tray is damaged (for example, a piece of plastic is chipped off or a metal plate is deformed), this can be the cause of the problem when the Xiaomi smartphone does not see the SIM card.
I had such a situation on my Mi 3. In the service center they could not find the cause of the problem, I found it myself.
I hope this information will help to somebody.