From a Home screen, tap the Contactsicon (lower-left).
If not available, swipe up to display all apps, then tap Contacts .
Tap the Menu icon (upper-left).
Tap Export to .vcf file.
If prompted for app permissions, review the info then tap ALLOW to continue.
Tap the Menu icon (upper-left) to view save locations.
Tap the name of the memory card.
The name varies depending upon the type of card used.
If the memory card location doesn't appear, navigate: Menu icon > Show SD / Memory Card then tap the Menu icon to return to the 'save to' location.
If necessary, navigate to the desired save location.