whatsapp: 5 things that can tell if someone has blocked you on WhatsApp
How to Block a Contact in WhatsApp
What Happens When You Block Someone on WhatsApp
How to Check If Someone Blocked You on WhatsApp
What does it look like if somebody's blocked me on WhatsApp?
WhatsApp will never relay the information directly to a contact that they are blocked.
Open WhatsApp application on your iPhone.