All my iphone contacts got deleted? What happened?

I woke up this morning to find that all my contacts got deleted. What happened and how can I prevent this from happening again?

Your cell phone has wiped? If you have backed all your contacts up on your computer/laptop great!

That means someone did something to your iCloud. Go to iCloud.com and check. Also if there's more then 1 phone on the account they will be coherient. Which means that the two phones are going to be the same. So if the person on the other phone deletes everything. All your stuff will be deleted.

Though iPhone uses quite a different storage mechanism, still you can recover deleted or lost data (such as text messages, contacts, photos etc) with a third party specific iPhone data recovery software called Tenorshare iTunes Data Recovery. I used it to recover deleted contacts from iPhone 4s and it worked.

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