1. To access the SIM card tray, insert the SIM key into the indicated slot.
   
2. Remove the SIM card tray from the device.
   
3. Place a Micro-SIM card into the tray with the contacts facing down.
   
4. Slide the SIM card tray back into the device, with the SIM card's contacts facing towards the front of the device.
   
5. If the device is powered on without a valid Micro-SIM card, the Missing SIM icon will display in the notifications bar.