Most smartphones nowadays are equipped with dual SIM support, making it simple to switch between SIM cards for tasks like calling, texting, and using 3G.
To select the SIM for texting on Asus Zenfone 3 ZE520KL, follow these steps:
Step 1: Access the 'Settings'.

Access the 'Settings'.
Step 2: Choose 'Dual SIM Card Settings'.

Select 'Dual SIM Card Settings'.
Step 3: Choose 'SMS Messaging'.

Select 'SMS Messaging'.
Step 4: Choose the default SIM for sending SMS.

Choose the default SIM for sending SMS.
Step 5: Choose the SIM when sending a message, then 'Hold the send button'. This will display the SIM options to choose the desired SIM for sending SMS.

Select the SMS sending SIM.
Wishing you all success.
