LG -P720 Quick Start Manual page 52

Contacts
You can automatically synchronise the contacts on the phone with any of your online address
books, or even import contacts from SIM/SD card.
10
Importing/exporting contacts
Touch > More > Import/Export.
To add a number from a recent call to your contacts, locate the
number in your call log, touch and hold the number, then select
Add to contacts. Touch Create new contact to create a new
contact entry, or touch Add to the existing to add a new number
to existing contacts.