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If we use the Xiaomi smartphone with two SIM cards, we can specify whether both SIM slots should use a 4G connection.

Note: This feature is device dependent and may not be supported by every model.

Android 11 | MIUI 12.0
Step 1: Tap on  Settings
Step 2: Tap on  SIM cards & mobile networks
Step 3: Enable or disable  Dual 4G
  1. Tap on Settings
  2. Tap on SIM cards & mobile networks
  3. Enable or disable Dual 4G
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