WhatsApp Group Call: How to Make Group Calls With WhatsApp on Android, iPhone
WhatsApp Group Call : You can make a video group calling with up to four individual at anytime and anywhere at Android or iPhone.
WhatsApp-Group-Settings
WhatsApp Group: How to protect yourself from being added to WhatsApp Groups
WhatsApp Group: WhatsApp has added a new feature in the groups setting, now users will be able to choose who can add or not them to group.