What the part is & why you might need it

This component is often described as the SIM Card Reader Board with Microphone (or SIM Card Holder Slot Flex Board with Mic) for OnePlus 7T. VOPMART.COM+2spare-parts-mobile.com+2

It handles the mechanical and electrical contacts for the SIM (and sometimes micro-SD) card tray, detecting when a SIM is inserted, enabling the phone to register the SIM, etc. It also often includes a small microphone module (for voice input during calls or for noise-cancelling) as part of the board. SunSky+