Open WhatsApp
Tap the three dots or Settings
Go to your profile
Tap your name
Delete or replace the name with a blank character if allowed
Save the changes
If blank name is not allowed, use a symbol or minimal text instead
To hide your profile photo, go to Privacy
Set Profile Photo to My Contacts or Nobody
To hide your About info, go to Privacy
Set About to My Contacts or Nobody
To hide your Last Seen and Online status, go to Privacy
Set Last Seen and Online to Nobody or My Contacts
To hide your status updates, go to Privacy
Set Status to My Contacts Except or Only Share With
To hide your number from unknown people, use privacy settings and avoid sharing your contact details publicly