tandu , via OnePlus 7T , Oct 27, 2020 : The sim slot 1 on my 7T stopped working a couple of months ago. I visited the service center and the person quoted me a repair cost of ₹21000 without even having a look at the phone, stating that the motherboard needs to be replaced. I went to a nearby local repair shop and got the sim tray replaced. That fixed the issue for me, but now 2 months later, out of nowhere the exact same problem has resurfaced. My sim in slot 1 isn't being read. Would anyone know what could the issue possibly be? P.S I've tried using both my sims in slot 1 and they both weren't read, whereas whichever sim was in slot 2 was being read fine. So the problem's in the slot itself and not the sim card.