How to insert a SIM into your Xiaomi Redmi 9AT

Find the opener for the card holder. Insert the opener into the small hole next to the card holder.

Remove the card holder from your phone.

Turn your SIM so the angled corner of the SIM matches the angled corner of the first SIM holder and place your SIM in the SIM holder.

Turn your SIM so the angled corner of the SIM matches the angled corner of the second SIM holder and place your SIM in the SIM holder.

Slide the card holder into your phone.