As the title suggests, the Xiaomi smartphone can disable mobile data when the device is locked or in standby to save battery power, and we can choose to turn off mobile data after 5 minutes, 10 minutes, or 30 minutes.

Android 10 (MIUI 12.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Battery & performance
Step 3:  Open the  Settings
Step 4:  Tap on  Turn off mobile data when device is locked
Step 5:  Choose an  option
  1. Open the Settings
  2. Tap on Battery & performance
  3. Open the Settings
  4. Tap on Turn off mobile data when device is locked
  5. Choose an option

Xiaomi Instructions
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