how do i set a silent ringtone on my iphone?
['Open the Contacts app.', 'Tap a contact.', 'Tap Edit at the top of the screen.', 'Tap Edit on the ″Ringtone Sound″ option.', 'Scroll down to the Ringtones section and tap the silent ringtone.', 'Tap Done at the top-right corner of the screen.']