I updated the version to my i phone 4 and deleted my photos and contacts...is there a way to get them back...i am not sure i backed up the data

i updated the version to my i phone 4 and deleted my photos and contacts...is there a way to get them back...i am not sure i backed up the data

Contacts are synced with a compatible programme on your computer (Outlook, Windows Contacts, Address book etc) or with a cloud service (iCLoud, Google, Yahoo). Sync your contacts back from wherever you were making the backup of them. If you have not been backing them anywhere, then they are most likely gone.
If you updated the iOS through iTunes and assuming that your photos were present at the time of update and you deleted the photos afterwards; you may try restoring the iPhone from the last backup, provided that you had not synced your iPhone after deleting the photos.
How to restore from a backup:
http://support.apple.com/kb/ht1766

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