Optus X SLEEK User Manual page 36

Add to/remove from Favourites
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To add a contact to favourites, you can touch a contact to open the
contact details screen and then touch to add the contact to favourites.
To remove a contact from favourites, touch on the contact details screen.
3.3.3 Editing your contacts
To edit contact information, touch on the contact details screen.
When finished, touch to save.
Change a contact's default phone number
The default phone number (the number which has priority when making a
call or sending a message) will always be displayed under the contact name.
To change the default phone number, long press the number you want
to set as the default number from the contact's details screen, then
select Set default. Then a
icon will appear ahead the number.
This choice is only available when the contact has more than one number.
Only phone and account contacts can be added to Favourites.
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