Dual SIM mode allows for easy selection of SIM cards for calling, texting, or internet use.
Set up Dual SIM mode on Asus Zenfone 4 Max ZC520KL following these instructions:
Step 1: Navigate to settings and select Dual SIM settings.

Access settings and choose dual SIM settings.
Step 2: Toggle the SIM card on or off.

Toggle the SIM card on or off.
Step 3: Select calling SIM.

Select calling SIM.
Step 4: Choose texting SIM.

Choose texting SIM.
With that, your setup process is complete. Wishing you all success!
