IPhone contacts disappeared. How do I get it back?

All my contacts were on my phone yesterday. Today I noticed that all my contacts were gone, but in the recent calls, it was replaced by their phone numbers. My notes are also gone. I haven't synced my phone for a few days, and it hadn't crashed or anything, so is there a way I could get them back? I tried to sync it, hoping it was backed up, but that didn't help. It was weird how it just disappeared out of nowhere. I haven't tried to turn it off than back on, afraid that everything on my phone would be lost.

Added (1). This happened the day I was notified that I could update to iOS 7.0.3. Maybe that could be the reason my contacts disappeared?

1. Open iTunes and connect your iPhone to your computer using the provided USB cable or your Wi-Fi connection. Wait until you see the iPhone icon appear in the left column of iTunes underneath the "Devices" category.
2. Select your iPhone and right-click it (Ctrl-click on a Mac) from the list of devices.
3. Select "Restore from Backup." ITunes displays your iPhone name as well as the most recent backup available. Click "Restore" to return your contacts to your iPhone.
4. Update your firmware, if necessary, as the backup does not include these updates.

Your contacts, Notes are all being used form the iCloud I think… Go to your iCloud settings and provide your credentials. Once you do that, make sure all options are On. This should bring back.

To know if this would help or not, go to a computer and open www.icloud.com and login with your iCloud id.

If you see all your contacts, notes there on the site, then setting up iCloud on your iPhone will work as well. And get back all those details.

If the details are not there also… May be someone knows your iCloud password and may have deleted from iCloud.com that in turn might have gone from your iPhone…

Wish you good luck. Hope this helps.

My Contact icon disappeared. How do I get it back?

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