Xiaomi 12 - Advanced Settings; Connect to Mobile Data; Set a Default Call SIM; Set a Default Data SIM

2. Tap a phone number to set SIM card.
3. Tap Preferred network type.
4. Choose a preferred network type.
Set a default call SIM
1. Go to
Settings > SIM cards & mobile networks.
2. Tap the number of a SIM card in Default for calls.
Set a default data SIM
1. Go to
Settings > SIM cards & mobile networks.
2. Tap the number of a SIM card in Data SIM.
Connect to mobile data
1. Go to
Settings > SIM cards & mobile networks.
2. Tap to enable Mobile data.
NOTE:
You can also swipe down the status bar and tap to enable mobile data.
Advanced settings
Use mobile data during VoLTE calls on the secondary SIM
During VoLTE calls, device connects to a mobile data network with the secondary
SIM.
1. Go to Settings > SIM cards & mobile networks > Advanced settings.
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