Open the bottom compartment. Slide the metal clip over the SIM card slot to the right to unlock it. Tilt it up to the right and lay in your MicroSIM card. (Be careful not to pop out the NanoSIM if your card is perforated.) Note the orientation of the notch to the lower left.
2. Close the bracket and slide it gently to the left to lock it in place. You should feel a slight click when the metal bracket is locked in place: