Miui, About dual sim, For more information – Xiaomi Mi 9 SE User Manual
Page 3: Sim card tray

Thank you for choosing Mi 9 SE
Long press the power button to turn on the device.
Follow the on-screen instructions to configure the device.
MIUI
Mi 9 SE comes pre-installed with MIUI, our customised Android-based OS
which pushes frequent updates and user-friendly features suggested by
over 200 million active users worldwide. For more information, please visit
www.miui.com.
About Dual SIM:
Dual 4G SIM requires the support of local telecom operator services, and
may not be available in all regions.
Supports dual nano-SIM cards. When using both SIM card slots, either
card can be set as the primary card.
Only certain regions and telecom operators support VoLTE.
System updates may be applied when network optimization occurs. For
details, please refer to the system version in use on the device.
For more information
Visit our official website: www.mi.com.
SIM Card Tray:
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Nano-SIM
Nano-SIM