1. To Add a recent caller to Contacts, in Phone, tap Recents, then tap the Info icon 'i' next to the number.
   Note: To add a new contact, tap Extras > Contacts > from the All Contacts screen tap the "+" icon.
   
2. Then tap Create New Contact, or tap Add to Existing Contact and choose a contact.
   
3. To Find a contact, tap the search field at the top of the contacts list and enter your search. You can also search your contacts with Spotlight Search.
   
4. To Share a contact, tap a contact, then tap Share Contact.
   
5. To Change a label, if a field has the wrong label, such as Home instead of Work, tap Edit.
   
6. Tap the Label.
   
7. Choose one from the list, or tap Add Custom Label to create one of your own.
   
8. To Delete a contact, go to the contact's card, then tap Edit. Scroll down, then tap Delete Contact.
   Note: Learn more from Apple support article: Contacts: Make a video call