Means to back-up contact number on iPhone?
If you've obtained a GMail account you can make use of the google exchange assistance to sync your contacts (and also schedules). This makes use of push updates so you do not require to connect to iTunes to support your contacts. Complete information here
By syncing your contacts with your computer system (you additionally get a backup of the information on your phone each time you sync sans music, images and also the real applications themselves - simply the information ). iTunes will certainly talk with Address Book on Mac OS X and also Outlook on Windows for desktop computer applications, or else you can make use of MobileMe, Yahoo or perhaps Gmail too to sync your contacts.
You can additionally export your contacts as vCards from your phone or personal digital assistant of selection and also conserve those someplace.