Unclip and remove the SIM Door.
Insert a 4FF-sized activated SIM card into the SIM1 slot (contacts up, notch in). The SIM card will click into place.
Important
If the SIM card does not click into place, verify that you have the card oriented correctly. The card will only click into place if oriented correctly.
(Optional) Insert an activated SIM into SIM2 with the same orientation.
Replace the SIM Door, ensuring it clicks into place.
(Optional) Install a SIM Door Screw to secure the SIMs in place.