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+1

• You might need to replace this part if:

  • the phone does not recognise the SIM card (shows “No SIM”, or “SIM card error”)

  • the SIM tray is loose, damaged or the contacts are bent

  • the microphone associated with that board is not functioning (if it shares the mic)

  • there are physical damages (e.g., the board cracked, connector broken)

Key Specifications & Features

• Compatibility: Specifically listed for OnePlus 7T. For example: “For OnePlus 7T SIM Card Reader Board With Mic.” spare-parts-mobile.com+1

• Form Factor: A small PCB (printed circuit board) often including:

  • the SIM card slot/contact assembly

  • flex cable or connector to the main board

  • small built-in microphone (in many aftermarket boards)

• Weight: One listing gives the package weight as ~0.01 kg (very light) since it’s a small module. spare-parts-mobile.com

• Condition: Usually brand-new replacement part, “checked and in good condition before shipping”. VOPMART.COM+1

• Installation Advice: Professional installation recommended, because the board must be aligned correctly, the flex cable connector must be handled carefully, and there are small screws or adhesives. Improper installation may cause damage. spare-parts-mobile.com+1

Compatibility & Notes

• Ensure your device is indeed OnePlus 7T and not a different variant (7T Pro / 7 Pro) because the board layout may differ.

• If your original board also had a microphone or other functions (e.g., noise-cancelling mic), get the version “with mic” if needed.

• After replacement: ensure the SIM tray fits smoothly, the SIM is recognised, calls/data work, and mic (if on that board) works properly.

• Use proper tools (static safe, screwdrivers, adhesive removal if needed). If you are not comfortable, better to take to a qualified technician.

 Why this part is useful

Replacing this board is a cost-effective way to restore full SIM (and possibly mic) functionality without replacing the entire phone or motherboard. For users who have a working OnePlus 7T but with SIM detection issues, this board can solve the problem and extend the phone's life.