2. Insert a 4FF-sized SIM into the slot marked with metal
contacts down and notch in. Press the SIM in until it clicks into
place.
To remove it, depress the SIM until it clicks and slides out a
short way, and then slide it out of the slot.
3. (Optional) Insert a second 4FF-sized SIM into the slot
marked for secondary/backup.
4. Replace the SIM cover.