If you use WhatsApp on iPhone, here’s how you can stop others from adding you to WhatsApp groups.
- Open WhatsApp on your iPhone and on the bottom bar, tap Settings.
- Next, tap Account > Privacy > Groups.
- On the next screen, select one of the three given options — Everyone, My Contacts and My Contacts Except. Over here as well you can select contacts one by one or you can just select all the contacts by tapping the Select All button on the bottom-right.