The Xiaomi Mi 9 runs MIUI based on Android 9.0 and packs 128GB of inbuilt storage. The Xiaomi Mi 9 is a dual-SIM (GSM and GSM) smartphone that accepts Nano-SIM and Nano-SIM cards.
Connectivity options on the Xiaomi Mi 9 include Wi-Fi 802.11 a/b/g/n/ac, GPS, Bluetooth v5.00, NFC, USB Type-C, 3G, and 4G. Sensors on the phone include accelerometer, ambient light sensor, compass/ magnetometer, gyroscope, proximity sensor, and fingerprint sensor. The Xiaomi Mi 9 supports face unlock with 3D face recognition.