You can customize the default message tones to your preferred music.
Set message tones on Vivo V7+ with the following instructions:
Step 1: Go to 'Settings' and select 'Volume'.

Select 'Volume'.
Step 2: Select Ringtone for SIM 1.

Select Ringtone for SIM 1.
Step 3: Select Ringtone for SIM 2.

Select Ringtone for SIM 2.
That concludes your setup process. Best wishes for your success.
