This hole is the access point for the SIM card tray.
Gently insert the pointed end of the SIM eject tool into the hole and apply slight pressure.
You will feel a subtle resistance as the tool engages with the internal mechanism of the SIM card tray.
As you continue to exert gentle pressure, the SIM card tray will begin to emerge from the slot.
Once the tray is partially ejected, you could carefully remove it from the equipment using your fingers.
The next step will involve ejecting the SIM card tray to prepare for the insertion of the SIM card.
With the SIM card tray in hand, take a moment to examine its design and orientation.
To eject the SIM card tray, gently place it on a flat surface with the notch facing upwards.
Continue to push the SIM eject tool until the SIM card tray is fully ejected from the gear.
Now, retrieve your SIM card from its packaging or remove it from your previous machine, if applicable.
With the SIM card oriented correctly, carefully position it over the designated slot on the SIM card tray.
To begin, carefully position the SIM card tray in alignment with the slot on your Note 10 Plus.
Conclusion
Congratulations!
You have successfully completed the process of inserting a SIM card into your Samsung Galaxy Note 10 Plus.