1. Enter the Settings menu. Tap Network & Internet > SIM card
2. You can set the preferred SIM card separately for Voice call, SMS message, Data transfer and Preferred Bluetooth Call settings.
a. For Voice call, you can either set to [SIM 1] or [SIM 2] or [Always ask].
b. For SMS message, Data transfer and Preferred Bluetooth call settings , you can either set to [SIM 1] or [SIM 2] .
