Xiaomi Mi 8 - Getting Started and System Information; About MIUI Operating System; SIM Card Tray and Dual SIM Usage

SIM Card Tray:
Nano-SIM
Nano-SIM
Dual 4G SIM requires the support of local telecom operator services, and may not be available
in all regions.
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.
About Dual SIM:
MIUI
Mi 8 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.
Thank you for choosing Mi 8
Long press the power button to turn on the device.
Follow the on-screen instructions to configure the device.
Visit our official website: www.mi.com
For more information