I have deleted my contacts from my galaxy ace

ksreddy Posts 1 Registration date Friday June 7, 2013 Status Member Last seen June 7, 2013 - Jun 7, 2013 at 01:29 PM
hi, im using samsung galaxy ace mobile, just now accidentally i deleted all of my contacts from my mobile and i was not restored for that contacts any previous backups, so i request u plz tel me how can retrieve all my contacts back to mobile.