Open WhatsApp
Go to the chat with the person
Tap the contact name at the top
View the phone number in the contact info
Open the contact’s profile in your phone’s Contacts app
Check the number saved for that contact
Ask the person to share their number directly
Use the WhatsApp contact card if they send it to you
Check the group info if the person is in a shared group
Save the number to your contacts and refresh WhatsApp
Open the chat details to see the linked number
Verify the number through the person’s shared business profile if applicable