First the date and time are stamped on the contact and then the location where you added or edited the contact is attached.
This enables you to scroll through contacts in reverse chronological order and see where you were at the time.
This acts just like the stock contacts manager and they cross pollinate each other with the added bonus of the date and time stamped on to the contact.
Contacts can be searched for by name, date, or location entered.
All deleted contacts are stored here forever.