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Do NOT Touch This Button On Your iPhone Or Apple Will Delete All Your Contacts

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dbecher / Flickr, CC

Many people prefer Apple's iPhone to Android phones for two reasons: The iPhone is simple to use and ultra-reliable.

Android, by contrast, can sometimes be a little tricky if you're not the most technically minded person. Contacts in Android can be complicated — it pulls contacts from all sorts of different databases and you end up with a ton of duplicated contacts unless you sit down and learn how to manage them.

So if you want simple contacts, iPhone is the way to go.

But the iPhone also has a huge danger area when it comes to questionable contacts management: iCloud.

iCloud, Apple's storage and backup system, will delete all the contacts on your iPhone if you make one wrong step inside your iPhone's settings. I discovered this myself recently, to my horror. It is the ultimate smartphone nightmare. I was innocently picking through my phone's "settings" section, trying to figure out how to free up enough space on my phone to accept Apple's latest operating system update when suddenly ... all the contact info for everyone I know just disappeared.

Everyone — gone.

I couldn't even call my mom (she just moved and got a new phone number).

My tech blogger colleagues will be laughing at me for this, I realize. We're supposed to know how a phone works. But the problem with iCloud is that it works in such a counterintuitive way that even among Apple fans, people avoid using iCloud or don't understand it.

iCloud is the Apple system that keeps backups of all the data and files you want. You can preserve your music and email in iCloud if you want. But for contacts, iCloud works slightly differently than other types of cloud backups.

Many cloud backup systems work by uploading a copy of the file on your device into the cloud. So the "real" file you care about is on your device; if you lose it there will be a copy in the cloud. (Carbonite works this way; Dropbox's main innovation was to not have duplicate real/cloud files — the file is either on your device or in the Dropbox cloud, but not both at the same time.)

When it comes to your iPhone contacts and iCloud, however, the reverse is true. If you've got iCloud backup for your contacts switched on, your iPhone contacts are stored in iCloud, NOT on your phone.

So if you switch that off, they all get deleted.

Trust me, it's a nightmare. The good news is that your contacts come back if you switch iCloud back on again. But that only means your contacts are trapped inside iCloud — they're not actually on your phone.

Here is how to avoid deleting your iPhone contacts via iCloud:

1. Go into Settings.

2. Go into iCloud.

icloud contacts iphone
The one button you should not touch on your iPhone.  Jim Edwards / BI

3. Look but do NOT touch the "Contacts" setting for iCloud.

4. If iCloud is "off" for contacts —  i.e. the slider is white — and your contacts are all still on your phone, then this means your contacts are stored only on your phone. This is great — unless you break your phone. Then your contacts are gone forever. You have no backup.

5. If iCloud is "on" for contacts — i.e. the slider is green — then your contacts are actually living in iCloud. If you switch iCloud off they will disappear from your phone. This means your contacts are trapped inside iCloud. This is great if you want to get a new Apple device — those contacts will magically transfer when you sign in.

6. If you do move the slider from on to off (green to white) then you'll be asked whether you want your contacts deleted or stored locally on your phone. Obviously do NOT delete your contacts. If you want them unhooked from iCloud, store them locally on the phone.

Bottom line: Apple has a function in its settings that will wipe out your contacts if you make a wrong move. This seems like a crazy thing to have on a phone, but there it is.

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Jim is the former editor-in-chief of Insider's news division.Previously he was the founding editor of Business Insider UK.He has also been managing editor at Adweek, an advertising columnist at CBS Interactive, and a Knight-Bagehot Fellow at Columbia Business School. His work has appeared in Slate, Salon, The Independent, MTV, The Nation and AOL.His investigative journalism changed the law in the US First Circuit Court of Appeals (U.S. v. Kravetz), the Third Circuit Court of Appeals (North Jersey Media v. Ashcroft), New Jersey (In Re El-Atriss), and New York State (Mosallem v. Berenson).The US Supreme Court cited his work on the death penalty in the concurrence to Baze v. Rees, on the issue of whether lethal injection is cruel or unusual.He won the Neal award for business journalism in 2005 for a series investigating bribes and kickbacks in the advertising business.Here's a selection of his past stories:   • The alleged betrayal in these photos, texts, and emails cost Snapchat $158 million   • Inside the conspiracy that forced Dov Charney out of American Apparel   • The Evolution of Ev: The creator of Twitter, Blogger, and Medium has a plan to fix the mess he made of the internet   • THE "KNOCK-IN SHORT": Nigel Farage and the massive bet against the pound on the night of the Brexit vote   • eBay worked with the FBI to put its top affiliate marketer in prison   • How Dunkin Donuts ended up hiring a psychotic credit card thief as director of communications   • BEJEWELED: The definitive, illustrated history of the most underrated game ever   • The CEO of Publicis told us how he stared down a furious internal rebellion to bet the future of his $11 billion company on artificial intelligence   • FBX: The billion-dollar Facebook business that never happened   • The €150 million check-kiting scam that bankrupted Leo Burnett in Greece   • My Polaroids of the September 11 attacks led me into America's secret court system for terrorist suspects   • YouTube deleted 130 rap videos to help police fight street gangs responsible for thousands of stabbingsDisclosure: I own shares of Twitter (TWTR).