Asus Zenfone 3 ZE552KL User Manual page 47

Assigning a preferred SIM card
Assign a SIM card as your preferred SIM for voice calls and data services.
SIM card for voice calls
When you make a call, your ASUS Phone automatically uses the preferred SIM card to connect the
call.
To assign a SIM card for voice calls, tap Voice call then tap the SIM that you want to use.
IMPORTANT! You can only use this feature if you make a call from your contacts list.
SIM card for data service
To assign a SIM card for data service, tap Data service network then select from SIM1 or SIM2.
47 Chapter 4: Keeping in touch