Take a simple paper clip and make it straight. How to open the iphone 7 sim card slot can also use the SIM eject tool if it’s included in the phone package. Insert the pin into the small hole and push it slightly firmly until the tray pops-out.
Now pull out the Sim card tray with your hands. Place your Micro SIM card into the SIM tray. Make sure it fits perfectly and the golden circuit side of SIM is faced downwards.
Push the tray back into slot in the same manner you ejected it out. You’ll hear a click upon successfully placing the tray in its place.