By default, automatic network selection is activated, but if we are abroad and have poor reception on the network we have selected, we can search the network manually.

Note: The network selection may cause additional costs.

Android 10 (MIUI 12.0)
Step 1:  Open the  Settings
Step 2:  Tap on  SIM cards & mobile networks
Step 3:  Choose a  SIM card   (Dual SIM)
Step 4:  Tap on  Mobile networks
Step 5:  Disable  Automatically select network
Step 6:  Tap on  Next
Step 7:  Confirm with  OK
Step 8:  Select a  network
  1. Open the Settings
  2. Tap on SIM cards & mobile networks
  3. Choose a SIM card (Dual SIM)
  4. Tap on Mobile networks
  5. Disable Automatically select network
  6. Tap on Next
  7. Confirm with OK
  8. Select a network

Xiaomi Instructions